Definitely an issue that I'm torn on.
On the one hand, it makes perfect sense that a place would have sufficient security to completely bar access to certain individuals. For non-public locations, like the back rooms of a corp hang-out, this makes perfect sense.
On the other hand, it makes for some great RP when people show up where they aren't wanted. I am certainly not going to argue if someone I really don't like (IC) shows up at my place. I now have the perfect excuse to godmode them to hell and back - it's my place, it's my over the top security, traps, robots of doom, etc. They walked into the trap, they can deal with it, and I’m always up for a good fight.
For example, someone showing up in the Gate who has been IC banned is likely to get shot (reputedly, I’ve not seen it happen though I guess I’ve heard about it). On the other hand, someone showing up at the Keep seems like they’re merely going to be shown the door – with the exception of Sani Sabik folks, who may actually get to have fun being assaulted and such.
The problem then with this is in metagaming. Or, for a more commonly used term, lurking. I personally would love to see it made a rule that you can only be in an IC channel if your character is physically there. There really isn’t any way that lurking isn’t metagaming, but oh well. You see conversations happening that you shouldn’t know about IC, you choose whether or not to show up somewhere based on who’s there – again, info you don’t have IC. Rather than actually having to communicate – maybe sending messages saying “hey, I’m going to the keep, want to swing by?” – people just show up wherever and then wait to see who decides to join them.
So, for example, if I’ve got a hang-out for me and my friends, and I want to be able to talk openly with them, I don’t want my enemies lurking in the channel listening. But if they can’t join the channel until they are actually present, then it makes perfect sense for them to hear anything that’s said after they enter – and then everyone is going to notice them and clam up.
In our recent example, (not to continue abusing Seri, he just happened to illustrate it perfectly) Seri didn’t really have an IC reason to show up at the Keep. He just happened to be lurking in the channel, saw the toasters, and arrived for the express purpose of noticing them and making a stink. Now, if someone actually at the party had sent him a message saying “haha the toasters got invited and you didn’t lol” and then he had shown up to see for himself and make a stink, sure. But in this case, it was an IC action motivated by knowledge that shouldn’t have been available IC. Again, we’ve probably all done this and I don’t want to harp on Seri for it, I just want to point out the downside to all the lurking we do. There isn’t a way to describe it other than metagaming, and the only real justifications for it boil down to “metagaming is more fun/convenient.”
… what was I talking about again?