@Carlos Lopes here's my real world example. I've been renting out my previous primary for 5 years. I had refinanced at 3% for 15 years prior to moving out. House was valued at approx. 125k when I moved out. Rent was 1200 and PITI was about 900 originally. It was basically breaking even cash flow wise. Luckily home values have gone up, the sale value now is about $210-220k . Tenants were paying $500 a month on the mortgage, only about $140 or so was interest. Tenants paid mortgage down from $98k to $68k now. I'm prepping it to sell, and house needs major repairs now (30k). So I'm paying that out of pocket to be reimbursed by the sale price later this year. Had I not been selling, this would all be out of pocket expense due to no saved up cash flow.
Rent value now is about $1500-1600. If I change my mind and keep it, I can now use a property manager to handle it, which stops any headaches but goes back to little to no cash flow. If I continued to self manage, it would be cash flowing.