The argument continues daily. But what is the correct way to get exotics. Personally, I bought mine with coins that I "Earned". If you get a lucky RNG then congrats, but do you deserve it any more? Let the voting decide.
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It makes even more sense if you compare it to legendary weapons. I got a legendary rocket launcher drop during pvp, if I bought it with marks then it would have cost 150 marks and taken over a week to earn provided I had the required rep. It takes a lot more time and effort to buy your gear.