Actually, I have have small stacks of Undead Bane shards, Evil Outsider Bane, Chaotic Outsider Bane, and a couple Dragon Bane shards. I made those when 10.1 was first previewed, and it looked the price was going to go way up on them. Not Greater Banes, regular old CL 40ish Banes.
Turns out, regular banes gained nothing of real value (except perhaps the Dragon Bane), so the stockpiling was unnecessary.
I do not have any Greater Bane shards. My highest CL is 54 in Divine.