Someone may have mentioned this. I didn't read all 70+ replies. Keep in mind why we got in trouble in 2007. I'd venture a guess that a lot (I want conjecture as to a %, but it's probably higher than we think) of those people really can't "afford" it. It's the same with expensive cars. Different people have different views of what they can afford. Some people have a really nice house and/or car and spend every cent they make every month on it, foregoing any type of investing. That means ANY negative change in their situation and it's all at risk. It's not just the "poor" who live paycheck to paycheck. Back in 2007, I was approved for a loan for my primary residence that was double what I actually bought. Had I bought a house at the level I was approved, I'm not sure how I'd eat or do anything else, but yet I was approved for that amount anyway.
I look at it a different way. Whenever I see someone with a really nice house or car, I often find myself asking "I wonder how much debt they are in and can they ever get out?" Sure, there are plenty of people out there who have these things and it's a small % of their income because they are truly rich, but my gut tells me that's not the majority.