when you want to sell an item with the market place mod you can hover over the item to see the lowest highest average and total listings, this usualy gives a wrong idea of what the price is since you can list an item to sell for 1mil and then the average price skyrockets. i suggest adding a median price or weighted price. or what even would be better is average bought price ( the average price the item is being bought that day/week/month/quarter/year)