maybe you should do something like:
Every user of bitcointalk that writes here his nickname receive x chips, if caught in multi account you will not receive any more money, something like that.
Good point! Anyone who wants to take a whack at FoldBot this afternoon, just post your boot52 handle right here and I'll credit your account with a few chips. To qualify, you must be a forum member in good standing and you can't be a newbie.