http://www.pcgamer.com/2013/02/01/valve-sued-by-german-consumer-group-because-steam-users-cant-resell-games/
Let me reiterate, I don't want game devs or publishers to be hurt but I also think consumers should have more rights and not risk losing content they buy licences to and lose all control as if they bought a CD.
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Err... PC games have never been something you can trade in (from my experience, anyway) due to product keys. Also, lets face it. If they bought it from steam they probably saved the amount of cash they would have gotten if they were actually able to trade it in by buying it there.