Paradise Poker (online Poker site) has a new player deal where you get a $100 bonus for a $400 deposit. Occurs to me that seven people could join getting $700 in bonuses and play against each other. Obviously you can lose, but only to someone in your group. Only 100 hands are required before cash-in allowing you to keep the rake well below the bonuses.

Practically speaking, this would likely look very suspicious.