My idea (not sure if anyone mentioned) is that maybe at the end of the game, gamers will have different choices that lead to different game ending, and the character also gets a permanent skill, attributes, or weapons. For example, like in the end, you helped the angels, you get to have a pair of wing and a boost on defense,,, or if you helped the devil, you grow out horns and get extra damage output...
http://www.youtube.com/watch?v=ZPuHO-6kpts
I think it's pretty sweet, but would you actually pay 50 or 60 bucks for this poker set?