If you've paid attention to the online poker world recently, you have probably noticed that may site's are now offering rake back. What is rake back? Rakeback is when a poker room rewards a portion of the "rake", or money that the poker room has made off that player, back to the player as an incentive to keep playing at the given room. The only catch is that it is usually paid by a third party site who pays the player directly. This can often result in shady business practices between 3rd party and affiliate sites. Some new sites have opted to use a points system which has brought about a new level of fairness in the rakeback world.
When a poker room offers rake back, they are usually trying to keep their players playing at their room. What does this do in the long run? It keeps all of the good, winning players around. A room that has been promoting rakeback deals for a long time can be said to have lots of sharks. New players usually avoid rakeback rooms since the play can be substantially better than at other rooms. On the other hand, some poker rooms do not allow rakeback. These rooms take on another method to obtaining both new and experienced players at the same time. They do this by giving away money. This rings in hordes of "fish" who want the free bankroll, and at the same time it brings in hordes of "sharks" looking to take advantage of all of the fish splashing around with their free bankroll.
While rakeback can be great if you are a consistent winning player, it can also be bad if you are new to the game. May advise new players to study the game first, and play within a comfortable limit. Remember that where there are fish ... sharks are soon to follow.