So like what I mean by this is that I think you should be able to sell stuff that you don't want or need like spawners or arrows. Sometimes, you have extra spawners and you want to get rid of them but get some money in the process. Or if you made a mob farm with skeletons. They drop a LOT of arrows and occasionally, I would have to get the arrows, and throw them into the void since I can't sell them. Maybe make like selling spawners give you 25% of how much is needed to buy it regardless of level and make arrows maybe like 100 coins or 150 coins to sell?