So I saw this video on the forums. It's a great video overall but a lot of people ask why we don't have trading and at 8:41 in the video he tell's you pretty much why. Overall a great video might answer some things you were wondering about as well.
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a trading system still requires someone to loot the item in question in the first place during gameplay. and you will still have to play the game to gather or loot the payment for said item.