I'm assuming OP intends to specifically exclude rental companies. As near as I can tell this plan would also exclude individual renters. Not sure how that would play out if someone wanted to defray the cost of their home by renting out a room or subdividing their home.

Do you not maintain the things that you own just because there will never be a day where it is worth 10x what you paid for it?

Btw I really want to meet these flippers and landlords who are maintaining their homes. Every time I have dealt with one they are obsessed with making it look like the house is great, not actually maintaining it. Oh wow you sprayed cookie dough smell before showing it, hey check out that black mold in the basement that stupidly has fucking sheetrock.