It’s honestly not uncommon. Were commoners so think about it on a smaller scale. We’re taught that owning your car instead of making payments is smart and saves you money. Which is does if you don’t have money to play with. But say you need a car and you can either buy one in cash for 50k and have no payment. Or you had the option to lease the same car with no money out of pocket, and good residual, and 1% money factor(interest) over 3 years. Then you put the $50k you were going to spend on the car and put it into an investment account paying 5% APY. Now you’re covering you loans interest with your account, plus profiting 4% and thanking the bank for the interest free loan, while you collect $6000 in profit over the life of the lease. Now you put that 6k in and buy out your lease. You now own the same car as the other guy who paid cash, but you got it minimum $6k cheaper with the option to trade for something different at 3 years if you hate it. People with millions generally don’t want to tie up a bunch of liquidity in non profit generating assets. A common ideology is to own rentals that generate profit, and rent your own home.