Yea maybe a need/greed option would work in the raid for armor, but thats as far as I would like a "trading" system to go. My buddy and i play together almost every time we're on, i have 2 ghorn and 2 IBs and he doesnt have an IB yet. I would gladly give him one in exchange since my titan has never been graced with the melee king of an auto rifle that is the Monte Carlo. However, Xur brought IB with him this week so he bought 2 with his stockpile of Coins. So if you just wait long enough and sit on those coins, then exotics come your way pretty easily. Here's hoping for all those who have missed out on the Ghorn that Xur brings it soon.