I buy an exotic from Xur ... I want an exotic that he has never sold ... I go to an outside source pay $20 and trade occurs in game.
EQ, WoW and many others also do this.
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Just can't see how a gold farmer who would bot with a terrible chance to get anything and someone would waste coins to get an exotic to trade for it. That would be -blam!-ing dumb and I can't see how the profits would out weigh the cost in this game. They aren't in every game. They had a tough time making a living in guild wars 2 since you could buy gold from the devs.