Priced in gold, judging from gold price history, or judging by the price histories for education, health care, or houses themselves, the $2.8 million after 50 years will be worth only about the same as the original $400K. Which means you will have a net loss in real terms. What's more, 7%/year doesn't cover property taxes or maintenence, which will add 2%-5%/year. So it's even more of a net loss. You will probably be able to buy more widgets and AI tokens with the money tho.