You say in the description that users can then resell their games when they don't need that anymore. The game is a digital version, right? It means that to save any value of the second hand game is to make a limited number of copies of that game, right? Are you going to encourage game devs making a limited number of copies? I don't think they will love this idea especially when there are more and more free-to-play games. DLC gives much more profit...