Eli5: If an insurance company is willing to sell you insurance, does that mean the insurance company is expecting to make profit and therefore you will make a loss and should not take up insurance?
In addition to what others have said about cost sharing and calculated risk, insurance companies also buy insurance. For example, if a hail storm destroys the roofs and siding of every house in town, the insurance company has an insurance policy to save them from the expense.
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