I think, basically, short of unrealistically laugheable prices as in other games, there are some features in the game, that make it so easy (relatively speaking) to amass wealth;
-Inventory:
henry has quite the powerful legs being able to (al be it at a snails pace) haul literally tons of loot around with not so much as a single pocket in his hose. The usual gaming inventory (only accounting for weight) and generously proportioned, allows henry to carry insane amounts of stuff with him.
I would guess, that the solution would be to implement a system not only caring about weight, but bulk, as well. Also, maybe give henry a very tiny inventory, but allow him to buy a pack or something, where to store more stuff.
Keep the weight/bulk capacity of that pack realistic.
possibly, some large market wallets (essentially a closed sack with an opening in the middle, would be ideal for carrying large amounts of stuff. would be nice to have an option to drop it at the press of a button, to enable combat and other interactions… i.e. letting it slide down the shoulder.
-Sizes:
Clothing, even loose fitting modern stuff, comes in diffrent sizes. normally tight fitting medieval clothing and especially armour have to fit reasonably well. I would suggest maybe introducing a simple system of general sizes into a game, could help against henries and henriettes of all colours just wearing EVERYTHING they find on a mysteriously deceased foe. I’d say, ideally, only clothes of the characters size really “work”. Clothing and Armour of a size or two too small/large may be made to work but with penalties in mobility, protection and DEFINATELY “charisma”. So a found plate is cheap and works reasonably well if vaguely the correct size, but you’re most likely forced to fork out the cash for a custom made one in your size, for max functionality.
Traders:
It should be possible to improve on the selection, what traders of what kind are willing to buy. Basically few should buy cuman armour for any more than material value.
A bakers trade relies on selling fresh pretzels, not buying a metric ton on hald rotten, maggot infested and crumpled ones a random stranger from out of town is trying to sell, with bits of someones brain still sticking to them.