In Illinois you didn’t have to ‘register’ for section 8 (I believe it was called ‘housing choice’), but it’s been a long time ago. (I owned a house that had two apartments; I lived in one, rented the other out.) Most tenants are functionally judgement-proof, unless you only rent to upper-middle class people. Sure, you might get a judgement against them, but that doesn’t mean you’ll ever see a penny of it. As far as not being a slumlord, I have absolutely no tolerance for landlords that don’t want to keep properties in good repair, full stop. Yeah, it’s expensive to replace a roof, but fuck you, that’s why you’re taking in rent.