I fill up my stash easily anytime I play more than one class. Even with one class I tend to fill it up eventually after collecting all the sets and items to support them, though that could probably be avoided if I wasn't too lazy to set up proper item filters in THUD as some of it always turns out to be too shitty to ever use. Or I could just admit there isn't a snowball's chance in hell of me ever playing Nat's or Archon or Uliana's or 95% of the other specs in the game and just throw away all those items immediately