I couldn't figure out exactly how to play I guess? No matter what i set prices to for the items they'd just leave and i'd lose 5 dollars? Though it's not clear how much money I even have to begin with. 
It'd be nice if there was some sort've indication maybe what they wanted to buy I think that might've been my problem as I did sell One thing? but it definitely wasn't a rip off. I think it would fit the theme if I could understand how to actually sell items to people