[gjm11]

I obviously felt my comment was already too long and wouldn't on balance benefit from a cautious parenthesis to the effect that you might actually get a lot more money back than you put in, or a lot less, depending on exactly what the housing market does, and that it also depends a lot on how much of the house you own (the limiting case of a 100% mortgage is, at least to begin with, almost indistinguishable from renting), but that to first order, assuming a reasonable amount of equity and no catastrophic shocks to the housing market, what you get out is at least a fair fraction of what you put in ... but as two people have commented on that omission, perhaps I was mistaken.

(As it happens, I indeed didn't own a house in the US 5-6 years ago, but I'm well aware of what happened.)