Yeah right... SAdmin getting banned...
He doesn't mean from the same specific server, he means they usually are banned by others for being stupid, annoying, etc.
Anyway, ID, as everyone said, is a means of identification and organization of users. It is linked to the auth key you get on registration and sometimes is used as a way by bored people to say how many people play, estimating out the 6/10 of users who left.
Your ID, 7930, is PRETTY high, I am 228.