I guess I've just been fortunate with my playerbase then.
Rogue who's family is a "widely" known fence in town. Some items he drops off to get cash, others for them to just "unload and get what they can from it".
Knight who regularly provides income support to her upper-mid class mercantile family as part of her duty.
Paladin who routinely tithes whenever able.
My biggest loot problem with these guys isn't getting them to cough up their "fair share"...it's getting them to quit fail-searching, turning right when the treasury is left, and otherwise managing to avoid the biggest and best caches of cash each dungeon has to offer. It's maddening, I tell ya.