I just finished watching the latest episode of extra creditz ( if you don't know what that is click here http://penny-arcade.com/patv/episode/collectable-games-part-1 ) and they mentioned something that was in COX. Booster packs. Card packs that had a random chance of different benefits such as inf, inspirations and even a rare chance of a costume piece or enhancement you could only get through these packs. A lot of people liked them, and from what I understood, could be wrong so I'm not saying I'm right, is that it was one of the more successful market items. I think we should have these booster packs as well, could be something to give the devs some more money to work with at the start.
not my video just one I lke ===> https://www.youtube.com/watch?v=U6-SdIN0hsM