I'll bet that many with big stashes 'tend' to have garages stuffed to the gills with other stuff.

I can see it being a mix of hobby (Finding a killer closeout deal IS a bit of a rush!), collecting (not a bad thing, it provides a little order in one's life), with varying doses of clinical irrational compulsion thrown into the mix. (My
PRECIOUS Penzoil PLATINUM!!)

FWLIW, I try to maintain a comparatively modest hoard, enough for 2 or 3 changes (1 ~ 2 years' use.) This gives me time to wait for a nice sale or rebate to come along. I can't see the sense in tying up hundreds of dollars in oil, although those of you that bought up gobs before the big petroleum run-up may disagree!

Current inventory is pretty puny: A motley 4 qt assortment consisting of 'broken' and leftover quarts purchased during various oil change (5qt+filter) specials, and two Purolator filters for a car I no longer work on. Being out of work, I can't see buying a whole lot, although I've set aside one of my M1 rebates in anticipation of upcoming 15w50EP end-of-life closeouts.