You know why there is not really a trade system right? You can have 1 exotic armor equipped, and 1 weapon. If you were able to trade, than as soon as you got 2 exotics of any kind you would be able to trade them for the 2 you want. Also once you have full purple armor than everything else is usless, so you could just give it to your friends. Players would not need to grind level 20-26. Player would also trade motes of light, energys, coins, and purple gear for shards. The game would take 30 hours to finish every single bit of content -PVP. Every mission, Every Strike, and The Vault.