A third risk (technically subsumed by 1): your local economy tanks, driving down both your income and the value of your house.
Buying a home to live in is a form of un-diversification.
Buying a home to live in is a form of un-diversification.
"Mark to mortgage" == vacancy. If you want to successfully speculate on real estate (as any homeowner does, landlord or occupant), you need to be willing to take losses over long periods of time.