To expand, just a bit, on what Soulcatcher was getting at.... it would be a very good idea to write WGT and ask them to disable ALL of the accounts you have, minus the one you want to keep, of course...
Should you not do this, WGT has the option of disabling / deleting ALL of your accounts even if you have purchased items... they would be forfeit. Should you happen to place in a tournament with said multiple accounts and happen to win a monetary prize, you could also be responsible for the return of said prizes.
You must be at least 18 and can only have one account. Those are the rules.
Peace