Personally, I hope that Bungie logs the username whenever anyone complains about Xur selling "Item X". Then, when he sells that item, he doesn't allow them to buy it. Furthermore, in return for their attempt to buy it, he changes their armor shader so that a big, flaming "H" (for "Hypocrite") is emblazoned on their chest.
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That sound f ucking awesome
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It glows in the dark, and attracts the fire of all enemies, allowing their teammates to run through sections unmolested. But, it also grants revives after 30 seconds, so their team doesn't have to come back to revive their sorry asses.