It's like one of the older Sims games where if you get a character with certain traits (I think introverted and artist?) you can build them an attic with a fridge, a bookshelf, a bathroom, a bed and unlimited art supplies and they will willingly spend their entire life up there churning out art when they're working and reading when they're not.

Not only are they happy being relegated to a specific part of the house forever, they generate enough to fund the whole entire household.