I don't think I've ever been banned.
Except once on old LG when I got yet another name change, and mods thought I was using multiple accounts or hacked someone else's or something because my iP showed up as two names for a certain amount of time.
Some stupid shit bug.
But other than that, never.
I only got banned once when I admitted to hacking another LG member after he blatantly gave out his password.