I get what you're saying, although while I personally am far from a coffee aficionado I certainly can tell the difference w/ a lot of their tomfoolery. The same can not be said w/ the audiophile stuff, not at all.

I dabble with fancy coffee now that I've got a few solid shops on my commute to work (the rest of the times I'm stopping at Dunkin Donuts, lest you think I'm more of a snob than I think) and my own personal policy is that for whatever variable X is involved that I'll only continue with X as long as I can tell a noticeable & pleasant difference. So for instance, I'll only get pourovers at places where I notice a difference between that and the standard (which implies quality of technique, according to the coffeenistas), or whatever beans they're using for a pourover if my reaction is "meh" I'll not get it again but other times I'll get it multiple times a day until they run out.

Agreed that this is all anecdotal and not double blind, and agreed that short of nuking things from orbit that double blind is the only way to be sure. However, as someone with very little skin in this game other than sometimes I want something better than Dunks, I can tell you that some variables matter to me and some don't.