[Pliskin]

There's only one way to deal with a con artist or a 'cheater'. You can either A) Get rid of them or B) Do nothing and watch it happen to more people.

There's a bunch of ways to get rid of them, too. But, unfortunatly, some people will do nothing because they think it wont work.

It's up to the person who got screwed to report it to 'authorities' and then deal with it in whichever way he wants to deal with it. Banning? He requests it. Negative Feedback? Up to them. Nothing else can be done if they decide not to do anything.