> The house gives you a place to live

A careful re-reading of my comment will reveal that I did mention rent as a factor in at least two places: one as an opportunity cost to be reckoned with for people following the PFI plan (with which my example still comes out looking good), one as a cost of living substantial enough for many working people that they do not have significant disposable income, which makes leveraging their largest living cost appealing.

> Interest rates are closer to 6.7% which means your $2500/mo doesn't even cover your principal and interest of $2600 which is to say nothing of PMI (which will be required since you didn't put 20% down), homeowner's insurance, HOA fees, or property taxes.

Using a 5% interest rate was one of several simplifying assumptions that I chose to be generous to the Buy Housing on a Loan plan.

You are correct that interest rates are presently and historically higher than that, and that mortgage insurance, homeowners insurance, property taxes, and some maintenance costs that under the BHL plan can add up to significant housing costs that aren't going to equity and therefore aren't well-leveraged. In other words, the BHL plan actually comes off worse than I made it look.

(If there's a counter side of that, it's that landlords can and will pass on those costs so they're reflected in rents... but sticklers will notice that landlords who are done with amortized costs or who financed at lower rates can choose not to do that and may have incentives to depending on the market.)

That's in absolute terms. There's a relative point too: the higher the interest rates, the more the field tilts towards the PFI. It magnifies debt/leverage, making that path more expensive, and it magnifies return from invested income, making that path more rewarding if you can swing it.

> And don't forget that other than insurance and taxes, your mortgage payment is capped for 30 years.

I did leave out the bounding effect that a mortgage can have, and that's arguably an important missing point.

Wy would someone do that? My observation is that incomes also tend to grow in rough parity to rents in many markets -- in fact, local income growth is probably the primary variable local rents are dependent on (at least in a functioning market). This means during prime earning years decades from retirement, rent changes might be an acceptable simplification. But you're probably right that the closer you get to retirement, the more important bounding costs is. And there might even be other situations where the tradeoff starts to make sense even for earners with significant disposable incomes.