Oh I should have known someone will get my idea wrong

I meant - if the dungeon is placed somewhere where htere is no logic to have loot in it, do you still want loot in it just because the dungeon is hard?
If the dungeon's "hard" and/or high level, there'd better be some loot or reward there. Otherwise, why bother fighting through all the enemies?
Also, any cave can have "human" loot in it - who's to say the last adventurer(s) to come in here didn't get eaten.... piles of gear stuffed in corners, with plenty of skeletons.
YES, an actual Wolf or Spider shouldn't have a sword or armor
on their corpse. But that doesn't mean their lair can't be full of swords & armor.