Offer your thoughts or opinion on the input financial query or topic using your financial background.

Why buy insurance?
The fundamental flaw here is conflating net worth with utility, at least failing to recognize that there's a nonlinear relationship between the two.  In the extreme example imagine taking a bet that will either make you twice as rich or completely broke. Your expected return is zero, but it would be pretty dumb to take it since being flat broke could ruin your life while being twice as rich may only improve it marginally. In more realistic cases most of your income is tied up in fixed costs, which magnifies relatively small perturbations to your net worth. Losing something essential (like your house or car), even if it's only 20% of your net worth, renders you effectively broke until you scrape together enough cash to get another one. That situation robs you of much more utility than you'd gain from a 20% increase in net worth. In either case, avoiding the risk is completely rational as long as you believe in nonlinear utility as a function of net worth, it's not just an issue of humans being "risk averse".