It's no more an exploit then that crap they call silver being used to buy things from us with real money... Or black spindle... Or NF drops... Or KF drops... Or ToC not having any real clear explanation on how long the cool down is or if it's only on multiple like bosses or not ( only a speculation never real answer).... Or basically anything from Bungie. I've never seen a company that loves to be vague for the sake of being vague, like they're in a real life RPG and this is some lame scenario.