Collusion does happen, thats not a question. With IM technology it is just too easy and there is no perfect way to watch for it. 2 frats I know of used to all sit in the same room and cheat. I know one of them got caught and had a few thousand in earnings frozen. I think the other one got away with it.

I got my account frozen, I am embarrassed to say, for "abuse of bonus codes." I was recruiting for the affiliates program in the chat box on party, which I had no idea was disallowed. They froze my account with 1000 dollars in it. They unfroze it when I called them, but I think they do keep your money if you are caught colluding.