In the story, Grey Mouser enters the fake Bazaar like a mouse enters a cheese-baited trap. As canny and arcane-savvy as he is, he doesn't hesitate- he goes into the store expecting to be able to buy wondrous things. While the situation may be rare, it is not so alien to him that he instinctively reacts with suspicion.
Now, from that point, any subsequent reader- even one turned author, game designer or GM- can then ask, "But what if the Bazaar HAD been selling legitimate magic items?" and spin a tale using that conceit.
Ah, now you're answering my question! Whether that "what if" could have happened in Lahkmar, whether the Mouser was acting rationally or otherwise, "what if" is still a basic story seed in SF&F. Thank you, sir.
"Elric is noted for using rare herbs and potions to maintain his energy when he is not under the influence of Stormbringer."
Another good example. Thank you again. But... is that really about adventuring, gaining gold, then spending that gold on magic items? I vaguely remember that he was the kind of person whose wealth was an assumed part of their background, and that how he paid for potions was no more an issue than how he paid for breakfast, lunch and dinner. You know those stories better than I do, so... is Elric a model for the 5E D&D character who's poring over a price list, and hoping that their next raid will yield enough gold for an armor upgrade? I mean, you've answered my late-in-the-thread sub-question, but I dunno if that also answers what gold *as adventure loot* is good for in 5E D&D, and whether gold is useless for those who have plate mail and can't find magic items for sale.
"post 1900 is when magic as technology and economic commodity first appeared in literature." Yup. People didn't have the mental models, before roughly 1900. How often does it appear between 1900 and 1940, or 1945 and 1970? (You know the genre at least as well as I do, and I'm curious what you can tell me.)
"I didn't get a CPRG of any kind until 1984, the first Wizardry game. Yet I've personally run campaigns with magic shops of some kind or another since at least 1980 or so. And the concept didn't originate with me, either- I encountered it as a player in games run by others."
So where *does* it originate? How plausible is it, that those others got the idea from Izchak's Magic Lighting Shop (or some other CRPG source)? How plausible that they got it from "Bazzar of the Bizzare" (or any other published-on-paper story)? Or is there a third answer?
At this point, we're in your personal experience, totally in your wheelhouse, you're the one with the primary source; I am asking, not debating. (Well, you said that I was totally wrong, and I'm introducing a theory in which I might be not so wrong, but I'm pointing out a gap in what you've said, not challenging the substance.)
I would like to know why what people expect in D&D campaigns, is *so different* than the source material which Gygax credits as having inspired the D&D setting - and why 5E PCs see gold as "useless" in a way which would have *baffled* Conan, Grey Mouser, Frodo, and Elric, as well as Arthur, Robin Hood, Beowulf and Odysseus.