Isn't it since people may have more than one IP address and renew new ones on consoles a lot?
[sub]While they may represent 60k, the server can detect similarities in them. They really only implement it though when they know for sure it's a ban jumper. Since the alternate accounts would have some similarities to the banned user or users in question it will check based on that. Another thing is that the proxy you use may be weak, and in that case more traces of your old IP address number are present in your new one. A weak proxy can be easily detected at times, but the stronger the proxy, the harder things can be to detect them. I learned all this from my friends in the IT department at school.[/sub]