I have no idea why this is still a thing other than to waste players time.
It's not even like Exotics get a bigger stat boost from masterworked or even additional effects or energy. Lower the cost or make it worth the cost please.
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Run coil and get a 130,000 score or greater. It rains shards, prisms, alloys, & cores in that activity. I generally focus 15+ exotics a week which mind you is 30 shards, all via the coil.