As it stands, it's much more efficient to simply do the first ten waves, kill boss, and back out. Which is, honestly bad design. Why is it not a guaranteed shiny weapon for completing all 50 waves and final boss?
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Outside of the emblem I really don’t think there is a point. I have done a couple match-made normal 50 waves and gotten two shiny weapons already. If legend guaranteed your attuned drop as a shiny at the end then I might at least consider it