Yeah, the rules say no collusion, but I have no idea how that's enforced given that the $$ is deposited to your account instantaneously upon winning.

That said, I find it hard to think of a situation where collusion would really be of any benefit to anyone. With the jackpot so big, it's ordinarily [ok, maybe not ALWAYS, but pretty close] in each player's interest to call down with almost any hand that has any chance to qualify for the jackpot.