Yes, but this method could also be applied to building better slot machines. The game itself requires very little skill or creative engagement on the part of the player. Farmville is evil game design; it takes advantage of human cognitive hooks and limitations for the purpose of profit.

Video games should expand upon what we are capable of. Reward structures and timed events are fine to a degree, but Zynga goes too far. This kind of manipulation needs to be addressed, especially as games become more and more thoroughly integrated with our society.