After dungeon diving, I have a wide variety of items [armors, weapons, potions, staves, books, circlets, jewlery, etc]
However, nearly no store will buy all these items. Furthermore, some stores, like the ones for potions, have almost no money in them, so it's impossible to sell anything in bulk.
It seems like the only way to circumvent this is to get a top level perk to increase gold by 1000, or just fast travel to every possible city and sell to every single vendor in town. IT TAKES FORVER.
Help please? How long does it take for vendors to respawn their base gold amount?