I think the problem with that argument runs that men are unfairly victimized by child support, alimony, and more. The problem with it is that the system is mostly unbiased, it's just that the system seems stacked against the man because marriage is stacked against the woman. They usually get more alimony because they usually make less money. When they do, it's often because it's their time that gets sacrificed to raise the kids, hence why they can usually prove they deserve custody. Once you can prove you deserve custody, child support follows.
In cases where stay-at-home dads get divorced from their wives, the courts generally decide in their way. Obviously, that doesn't happen very often just because of how families tend to work in the western world, but it does happen. It's more often that equally invested couples who divorce get split custody and nobody gets alimony.
I think this betrays a little bit of bias on your part. I think that, if you consider time spent with the kids to be a "sacrifice", you are probably not viewing child-rearing in the most healthy way. As well, given the fact that the pay gap is not as large as the custody gap, and given the fact that many mothers work, using your explanation doesn't seem to explain this large of a deviation from the theoretical norm. Nor do my anecdotal experiences bear this out: there are at least some mothers who see custody as a means of leverage and manipulation.
That said, I'll be honest: this is a mild academic interest for me, and I don't put much stock in anecdotes. I don't intend to have kids, and I find that I'm far happier (minus the occasional day or two a year) on the average if I'm focused on my own well-being, as opposed to someone else's. I'm more interested by far in dealing with issues like the lack of a social safety net for men and the lack of awareness regarding female domestic violence.
Also to be fair, I started dating my wife when I was eighteen, and it's been almost 11 years now. The point of getting married is to not get divorced unless something really, really bad happens.
Something really, really bad must happen to a lot of people. Like, over half.
I think there's a lot of societal pressure on men (I can't speak for women on this) to get married. At least, people have put it on me. I think one of my favorites was being told that I was selfish, as there was some girl out there who needed me in her life, or a partner, or something like that. More common has been the intimation or the outright assertion that my worth is to be found in supporting a wife and children. Or rather infantile bits like this: http://online.wsj.com/news/articles/SB10001424052748704409004576146321725889448. Now, despite the fact that I have my own place, I suspect that I am one of the people who the author has a problem with, because I'm not "manning up" to be a good partner. Well, I don't think that this societal pressure is good for the divorce rate, and as for me, I'm far more interested in money than sex, much less marriage.
If it's unhealthy to not like kids, then I'm probably pretty sick. Then again, I don't want to have kids because I grew up in a family where my dad definitely didn't want them, he just had them because that's what you did for most people in the 80s. He didn't dislike us, in fact I distinctly remember him sometimes liking it when we were around. But it was later in life that I realized that it really was a sacrifice for him, the same as it would be for me. Kids are either cute or annoying, and for him and me they're annoying. I don't think he really liked consistently talking to me until I was almost in college. Thank God my mother's not like that. She thinks kids are cute. So when my parents split, my mom got custody, my dad got visitation, and that was fine for the both of them. I was a fairly happy kid of divorced parents.
I guess I never worried much about female domestic violence because if a woman ever got violent with me, I might not knock her head off but I would definitely not stay with her. Call me egomaniacal, but I think I'm a damn fine man and I'm worth having. Maybe it's more a result of my upbringing, but I see abused men the same way I see abused women, that they're victims mostly due to low self-confidence and not having anywhere to fall back to. I've never had that problem. My family, though divorced, is pretty tight-knit and I don't have to take anyone's shit. If I ever had to go back to the single-people marketplace, I don't think I'd sit on the shelf that long.
I've got no problem saying that's my opinion and it comes from a very specific place. I tend to react to societal pressure to do anything (drink, smoke, get married, have kids, cut my hair) with a degree of hostility and suspicion. The weird thing is that I didn't want to get married in high school; I thought it was a religious anachronism. However, I think being married is something I can recommend. My relationship is a lot different than someone with a long-term, live-in girlfriend just in terms of how I seem to view my own relationship. That's why I've been to so many gay marriage rallies here in town.
It's one of those things that doesn't seem important until you've been with someone for a while and you know that she's it, you're never going to meet anyone better in all your life. You meet a girl who loves pocket-healing your raids, doesn't mind not having kids, hangs on your every word about the benefits of .30-06 ammunition, enjoys your first date seeing House of 1000 Corpses in theater, graduates summa cum laude, thinks your hairy chest and stomach is sexy, goes with you on a six hour pilgrimage to see Slayer live, refuses to drink because she knows your family history and teetotals with you through college even though she went to hers two hours away, you don't come to an understanding on your living arrangements. You marry that woman and you never look back.
I think the reason the divorce rate is so high is because people don't get married for the above reason (or, you know, whatever's important for people who don't like that stuff). They get married for reasons like they got their fling pregnant or because they went on a few good dates and get impulsive. I'll be frank as well, forever is a long, long time. Lots of men and women get intermittently bored and for some reason single men and women like married men and women a lot (maybe it's because you get attached to someone pretty quick if you're decently good looking and easy to get along with). Even if you know it's a bad idea, that your wife is amazing and you couldn't ask for better, you're going to be tempted because of the sheer volume of flirting that suddenly gets fired your way. Marriage is for people with a lot of discipline that aren't prone to bouts of stupidity. Anytime you spend a lot of time with someone, they'll get on your nerves now and again, and your spouse will always be there with you, will probably want to go to all of your functions, will know all of your friends, will live, sleep, and eat with you every single day for hopefully the rest of your life. Yes, there are times I have to go somewhere and do my own thing for a few hours just because you can't handle any person without a break.
But do I recommend it? Absolutely! I dated my wife all the way through college then moved in with her in Houston for a while before we got the whole wedding planned. That period where everyone said I was supposed to be having wild parties and screwing around, I was attached and I spent it hoping it was going to work out with this one woman. Was it worth it? My anniversary is on FUCKING HALLOWEEN! We had a costume party for a wedding! I guarantee you that no man has ever thought his life would turn out quite so good as that. It's a lot different to be able to say to someone that this woman isn't your girlfriend or your "partner" (which I always hated because it sounds like you're running a small business), but this is your wife and you're planning on being with her, good or bad, until the cholesterol problems that plague your family tree ends up popping your ancient heart like a water balloon.
Coming from someone who thought otherwise, it doesn't just change how your family and friends see your relationship, but how you see it. It kind of gets beyond a joint enterprise of sex and child rearing and becomes more of a life mission statement. Lots of people don't get that until it's too late. Even with everything going on now, when I spend a lot of time with her at her parents' house (her father's not probably going to make it another year) and away from things that maybe make me happy, I know that she's not in this thing for her own pleasure either and she'll be there when I need help. A good wife or husband is the rock you put your back against that handles the other half of the shit that gets flung at you from all directions. It was really nice when I got laid off and her income basically made up for what I lost in unemployment until I got another job. She's also my biggest cheerleader.
Don't get married if your relationship is weak and you think it needs to be stronger, but I can definitely say that once you think you've got "the" woman, do the marriage thing. If you get it wrong, you don't really end up much worse off than when you were single, but if you get it right, your life gets easier on the whole. You get someone that can pick up the slack, especially on things you're not good at, as long as you're willing to specialize a little on the things that you're good at for them. And yes, even as you said, you do get booty on tap.
I guess if you really just don't like other people though, that might be a hassle. Just saying, marriage gets a bad rap from people who make bad decisions, but I figure a 50% rate on something that's usually done in your 20s-30s that lasts until someone dies is a pretty damn good statistic. These days, when being divorced isn't a point of much ostracism anymore and you don't have the widespread puritanical view of ironclad marriage we used to (thank God), 50% means people must be making better decisions than I give them credit for. I'm shocked that many people make it the whole stretch.
... I think I may have posted a lot more about marriage during this little stream-of-consciousness defense of marriage than I wanted to.