billcollector -
in a car accident, you have two sets of insurance to pay your bills, in addition to helth insurance. Your auto medpay is primary. After that, the person who hit you contributes, and finally you have "under/uninsured" coverage if someone hit you without enough coverage.
No one can lose their house over unpaid medical bills. As far as I know, there's not a single state that doesn't treat a home as an "excluded asset" from bankruptcy, if you choose to continue to pay the mortgage.
Insurance is -EV. But insurance reduces your risk of ruin. My advise (as a former insurance lawyer) is to get high-limits insurance with a HUGE deductible. If you can afford to pay 5k, get a 5k deductible and bank the difference every month.