A game ive been playign recently: Knight Online. Has a very good stall concept. You type: /merchant and choose what items to sell and your price, then your character sets up a little stall, you can go afk all day and come back and people have bought your things. I like it. i play that game it rules and yea the maket is a good idea but only have certain places to set them up like in banks and around or around town centres ect.