Maxperson
Morkus from Orkus
Yeah. I run the Forgotten Realms. Those Volo's books, they're from an edition(3e) where you are on a magic item treadmill and are expected to have a billion small items by level 2(slight exaggeration). The actual world, though? There are a lot of powerful wizards, but there weren't a lot of actual magic shops in 1e and 2e. Magic was primarily found, not bought.Have you played in the Forgotten Realms, or Eberron?
… ever read a Volo’s guidebook?
… or read Return to the Temple of Elemental Evil
… or any Paizo Adventure Path.
Prevalence of magic and resources is a dial, you turn up or down. If you prefer one inn every 150 miles that’s your prerogative.
A Red Wizard enclave(3e retcon of Red Wizards to allow magic item sales) isn't going to a small town to sell, because no one there can afford it. They would go to a city where there are buyers.