I just cleaned out my box and threw away most of my evo materials. Once I get Fat Dragon all of my active and immediately projected guys are fully evolved, and now that I have farming setups for mythical weekday dungeons I no longer need to stockpile them.
Hung on to the broadly useful/hard to farm stuff (Mythlits, Dub-Topalits), orbs, and materials for Odin, Chester, and a few other assorted utility subs with no immediate usage plans, but I no longer feel the need to maintain my "two of everything" policy. And I need space for all of the Dragon Plants I need to keep around now!