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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I'd also think it would be nice if you'd get back all the materials you put into masterworking gear when you dismantle it. It sucks to have a piece of masterworked armor and then have another one drop with better stats and then have to waste even more mats to mw it.