> You're choosing one part of my comment in isolation and arguing against it without context.
No, I'm not, I'm just excerpting the part that's most clear in explaining the focus of the response; we're in a medium where the whole context is preserved and directly accessible, so there is no reason to include the whole thing -- its already right here and available the reader.
> There's more to choosing to buy than simply the pure financial motivation.
That's true, and not a part of your comment that I have an issue with; its quite correct that looking only at the financials -- and even within the financials only the expected returns and not, e.g., the particular risks involved, since the disutility associated with risk is not consistent among individuals -- potentially understates the value of buying (but, that's true of renting, too). But that's irrelevant to the question of whether comparison to investing as an alternative is a false comparison based on the observation that people who aren't purchasing wouldn't often have the downpayment available immediately to invest.