The user name is banned, but if the user registers another account but doesn't make a change for the good then the admins can IP ban them to prevent them coming back again.
Actually, the mods send out a five-man crew, and they repeatedly whack you in the noggin with a Louisville Slugger until the only thing you can say is, "Nitto Racing."
Not meaning to sound like a hypocrite here but I think you guys are a little too soft on the banning front. I realise one chance is good enough (lookie here at yours truely) but anything after that shouldn't be accepted.