In order to get a handle on multiple account scum, WGT needs to go to a "CC Required" for all tournaments, Ready Gos, Match Play Challenges, etc. Basically anything where you can win credits needs to have something to individualize each account.
Now, that's not saying that you would have to present the CC at the beginning of each tournament, etc,... it's requesting that you present the CC when the account is registered.
The idea is not fool-proof. Sitting here I can think of half a dozen ways around it, but then again, it's better than the current system of nothing at all.
Peace.