[Exxy]

Not to mention I'm not sure if player housing is exactly the most reliable storage method (I believe there have been lost save files for houses before that affect items, maybe I'm remembering that wrong-- it is 5 AM here after all).

Knocking down the cost per Bank Slot Increase would be a good start. If there's a concern for a limit, I'd say just pick either 100 or 200 and try it out.