If you'll read my first post you'll understand that just being able to sell your darfty is not enough.
Anyways, you keep saying that this feature will open up a lot of new ways to cheat but that's it, you don't give any reason why or how.
You don't even criticize the actual feature and what it can bring to the game, all you do is just invalidating it simply because of the unbased assumption that the new market might lead to new cheating possibilities.