As Gauntlet has progressed I have started letting go of more and more of my dupes as well. There are a few I've saved just because there are some arena combinations I always "wanted to try". A year ago they might have worked, but now they are old and gimmicky so it is purely nostalgia that has me holding on to most dupes at this point.

I burned a lot of dupes during this event to get skill shards and new characters.