I have noticed that there have been a lot of player shops, but two things have occurred. One, many shops have been run down, so many items that could be in use are no longer available. Two, there has been a lot of scams and misunderstandings in trading items for money. A fix I think would be to give players the mod that allows them to put buy and sell signs on chests. This way, all the items are secure and easy to buy and sell, and people who don't play anymore can still sell their items to players in need.