Well, since you brought this up, and because of the way the buying items work, I think that either there should be a little box where you can throw items in it and they give you 1/2 of the cash back, (1/2 so that Criminal's dont make a fortune selling there newbie crap.) Or there should be a A.I. Bot that would actually buy your stuff. (Harder to code, but more efficent, and can reject criminals.)