Quote Originally Posted by Hysterior View Post
That works for banning accounts of real users buying from goldsellers. Yes.
But not against the bots themselves. They can change IP on the fly and they continuously create multiple accounts from multiple IP every minute. It does not matter if some accounts fall in SE's net.
IP bans don't work at all. Virtually any IP provider is handing out dynamic IP address these days. At best they are ineffective and at worst you hit some unsuspecting other player that happens to got one of the banned addresses.