Don't you hate it when you have a certain reagent or gear piece but don't need it and your friend has the gear piece or reagent you want, since there is no trading you go to the bazaar and sell it but then someone else buys it. This has happened to me countless times, so, I introduce the Bazaar(Housing Item). The Bazaar is a small little shop you MUST put up against a wall in your house. You can walk up to it and sell it anything you want, it pays you and the item you just sold goes into the bazaar's inventory. Your friend can then teleport to you and access the bazaar in which they can buy the item you just sold without having to worry about other players stealing it. The bazaar item could be a crown shop crown/gold item for maybe say, 200 crowns or 20,000 gold? I hope you enjoy and thanks for reading
As great as this idea sounds in theory, in reality I don't think it would work, for the same reason an item trading system wouldn't. KingsIsle would lose a ton of money, because players wouldn't need to buy so many crowns to get the items they want from packs.