“When we bought our car, the cost of leasing it would have been around $616 per month. The actual cost of the car including tax and warranty was $21,000. We drove it without issues for 111 months. To keep things simple by ignoring the time value of money, lease price inflation, lease buyout, and many other factors, that means the car has been essentially free for the past 77 months. You can quibble with that math of course as it is oversimplified, but buying that car was a no-brainer for us.”
Still has nothing to do with buying vs leasing.
There are two very different things being conflated here.
1)Getting a car every 3 years vs 10 years -As with most things in life, it obviously costs more to buy stuff more often.
2) Buying vs leasing - this depends on many factors, but many times it makes more sense to lease a new car then buy and sell after 3 years. The key is to look at the TCO.