"$50K in 1960 is worth a heck of a lot more than $500K today. If that was your house you would now be poorer"
But you only put down $10k, and after 20 years, you nearly own $400k. (say 20% left of mortgage) and a place to live vs rent, or after max 30 years, rental income for life.
A 3900% return on equity...and eventually no cost bar rates/insurance
