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Right now the leagues that you are in are designed to make the game feel more competative so you can try and over take people in your league or something like that. I don't feel like over taking a bunch of random people is that rewarding though. Maybe if there was a leader board with all your friends on it with your ranking would make competing more rewarding.
Kind of like the facebook aps in which your highscore isn't shown against the top players in the world but rather against your facebook friends, which makes beating them so much more satisfying.