My first impression was that it would be something similar to Team Fortress 2. There people create hats, weapons and other content, and Valve sometimes picks high quality items and sells them ( they aren't really better than what you can have for free, mostly cosmetic stuff ) and the artist gets a portion of the profit. Steam workshop has support for  this kind of things as far as I know, though I don't know if this game is headed that way. This was my speculation.