Why? With all the repeat exotics you get from engrams from 3 of coins and xur ( that bungie said would happen MUCH less),Everyone should have a ton. I've got 26 on 1 character.
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Sure, if you like the grind of heroic strikes. After Bungie -blam!-ed op Hopscotch Pilgrim I'm not falling for that one again. Besides that, I only get one exotic from every 10 3oC I use (1 3oC per strike is 1 exotic every 10 strikes or so). Easiest thing is xur to just sell them.