My parents financed their retirement that way. Buying houses then renting them out. (I'm many pages back, lol but I'll catch up!)Yeah, my dad is the "property manager," as he likes to call it. We don't buy them to rent them out on purpose though. We just happen to see a better house, move, and then not want to sell. My dad thinks that selling a house is never a good idea, unless it can't be rented out. Which I agree with too.
My parents always joke around and say that my mom loves buying houses and my dad loves to manage them.