It was a promotional thing with Reebok. Stuff like this happens all the time with DLC for games. No need to feel disrespected because it doesn't benefit you right now. A lot of other games have 360-only promos.
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To answer the OP, the DLC is kind of interesting to play with. Being a fan of the Bears, I have no incentive to get it, but I'm on PS3 and got it for free. For free, it's fun. Would I have paid for it? Having no vested interest in any team that was part of the AFL, probably not.