It's only "crazy" if your context is an aberrant period of time when borrowing huge sums of money was basically free. Plenty of people alive today bought homes at 8, 10, 12, 15% interest rates.

I think that's more normal. When my parents bought I think they said it was 13 in the late 80s. We've just been spoiled by ZIRP

The economy got addicted to cheap money. 7% is historically pretty reasonable. The problem for houses is that we didn't build any after the 2008 crisis and the baby boomers have enacted a lot of policies for themselves that cut their property taxes at the expense of young people who want to buy their first home.