I'm doing that, since I bought a home. You're suggesting that we should have spent much more on a house, using the interest write-off to lower our tax burden.
My point is that it would have been irresponsible to spend more on a house than we can support on one budget. And that the mortgage interest deduction, doesn't really make that big a deal.
I paid $6k in mortgage interest last year. It got me $750 back on my taxes.