ojas :
I dunno, trade games in for credits? If i got 50% of the value of each game i sold "back" to steam, i could put that money into another game...
and what would you be selling back to them, its digitla content, there is nothing they gain in the transaction, except maybe return business, but even then, they are ultimately gonna give you another game for less than normal price, they ultimately dont win, or win very little