Folks aren't generally getting rich from HUD: In Indiana, at least, lots won't accept HUD due to regulations and not paying on time. The last bit should be fixed, the first bit should just be standard for rentals. Landlords wouldn't necessarily know if they just let it be shown as regular income.

Besides, this does hinge on there being enough housing - including a few empty places. It is better to generally have empty units available just like you want a little unemployment to have a pool of employees to choose from.