True, but buying a house now is betting that that tax deduction is going to exist for the next 20 years. The financial situation of the US is insane. The next 20 years aren't going to look anything like the last 40.
I spent it entirely on things I now do not have. Going out to eat, buying books and CDs, etc. There were times I genuinely could not have afforded to save five or ten percent of what I was making, but lots of times I could have.