I'd also like to add, having thought about this and talked to others over the past 24 hours, that 'buying your way past' gameplay, for many (including me) reduces enjoyment in that gameplay even if it's something we enjoy doing.
No, this isn't perfectly logical. If an activity is fun, it should be still fun if there's no actual benefit, right?
Well, wrong, for many. I noticed in other games that had purchasable progression options that, once I reached the level that allowed me to use them, my enjoyment in the gameplay diminished, no matter how much I had enjoyed it up until then. There's a reason single-player games don't put the cheat codes right on the back of the box, after all. Many activities that are enjoyable when coupled with a sense of achievement - even a fleeting and artificial one, like a game reward - are not enjoyable when they become meaningless repetition that is being done for no purpose.
When I first got out into the workforce and started earning real money, I spent a bunch of it on things to make my parents' lives easier - a lawn-moving service, a regular maintenance guy, etc. My mother, however, politely but firmly refused the laundry service that would have washed, dried and ironed all their business shirts once a week. She explained that she enjoyed spending a quiet Sunday afternoon ironing, and I was trying to ruin her favourite part of the week.
Being young and stupid, I asked, "But if you want to iron sometime, can't you just iron the stuff again?"
That, she told me, was not the point.
And it isn't.
People's reactions to this proposal are not just about someone else buying an advantage. They're about a fundamental change to their gameplay and their enjoyment. 'Opt out' cash-buttons are not compatible with what I enjoy in EVE.
They may come, and they may be popular, and they may bring in new players. But they will not be without cost for others.