The problem is that anyone can just go and create a new account. If you've invested no capital (i.e., building a name for yourself, making neat games), then there's nothing to lose by losing your account. And I can't stop someone from making 10000 accounts.If there was a way to verify an person's identity, then we could keep it to one account/person. But, shy of requiring a credit card (and even then, you can have many CCs), I don't know a way of doing that.
The real trick is to ignore & delete. Moderators (I think) love useing their "powers", so really, the "valdalizers" are really just keeping the Mods "employed." I will make it easier for Mods to kill comments, posts, and even games, but as far as trying to ban people, it's a battle that can't be won.