well, I don't play it, but I guess the thing is people are using bots to beat and mug people. I don't know too much about the game, but if you get more powerful by spending more time fighting and winning, that a well programmed bot can play 24/7 and probably get pretty powerful.
The funniest part though is the selling of items on ebay.
Like I say, it's a strange world we live in.