Sell it for 20€ or $20. Lean back and count the incoming money. And when people ask when we will finally add the feature that the character can not only go forward but also backward, we will ban him from Steam forum immediately.
Wait what? Everyone is doing this now? Pff, then I don't want anymore.
I do get the OP's point. It really would be a great thought to be able to sell your own copies of the game. I am sure however that would not be feasible.
In a perfect world, it would be like this site I used to play on quite a bit that had games with cheats installed; arcade pre-hacks [url]www.arcadeprehacks.com/' target='_blank'>Link. While it was only flash games, it would be a cool premise for C/H. Get a copy of a game and sell it already "pre-hacked" with your cheats built in and without worry of dev's constantly hosing your work.
* Updated game trainers and cheats daily
* Get notified when new cheats are added
* Request which games get new trainers
* Priority support with any problem