While I was looking for shops on different servers, I noticed that someone had decided to set up a chest that said," Buy this dirt for option one, buy this dirt for option two." They were one rupee each, and were part of a poll. I think that it would be cool to be able to set up certain shops, like polls, where a player can buy an item then be refunded for the price. Just putting out an idea.
Your right this cant be done now because the shop owner cant put a buy back chest cuz someone might spam the chest. But isnt that why we have the poll thing built into the thread?
