Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Why buy insurance?
There are many situations where injecting a certain amount of cash at the right time may reap rewards far in excess of the value of the cash injected. For example, if someone who needs a car to get to work gets in a wreck and that person does not have ready money to make it driveable may have no choice but to secure very expensive financing.  Receipt of $1000 in ready money to repair the car may thus save the person from having to take out a loan that would cost $1200 or more to repay. While the insurance business has sufficient overhead that it is unlikely that insurance would generally have a positive net expectation even considering such factors, it is at least theoretically possible that insurance could have a positive expected value for both the insurer and the insured (and in some cases it may have positive expected values for both parties in practice as well).