And ip address won't stop anything.
How the hell do you think the authorities clamp down on cyber crimes.....pedo's....& billion dollar copyright infringements/internet piracy? There's tools available that can be used to search back through multiple uses of proxies/anon proxies/ghost proxies in order to trace the original ip used.
Sure......such methods are only used to catch big fish.........but it's all down to the ip address. What other method would you suggest.......considering this is an online game?
So a static IP address used to log in and play 10+ different accounts.......you wouldn't find that a bit suspicious at all? You wouldn't feel the need to check it out?
Of course it won't catch every multiaccounter.......but it will catch many. It'll catch a damn site more than seems to happening right now.
There's IP tools available that would check WGT's entire database records (including archives)....which would throw up a list of suspect IP addresses used to log into...say for instance 10+ accounts over the period of 12 months or whatever period.