Of course, there should be some sort of trading implemented into the game, where two players would agree on something they like, lets say, a helmet. Now the player trading away the helmet would put it up, then ask for marks, glimmer, or another item they would like to recieve in the trade. I believe this is a good idea, but the system should have some restrictions. Like, the item they are trading should be matched with another item valued at around the same price, or if they are asking for glimmer, it simply should only be able to be sold for the price you can buy it at, no higher. One last thing it markets. A place where items are cheaper and sold quickly by other players who put that item on the "market". And a possible function in these "markets" could be bidding for an item between other players. Thanks for reading!