Scenario: you have been working for days to finish an exotic bounty, only to have that exotic fall to you after a crucible match. You may as well finish and get the exotic again, just to get a few shards. wouldn't it be great though if you could trade that exotic weapon for something from Xur? not trading with other players, that would be a bad idea. But says trade and pay a 5 strange coin transaction fee to Xur.