I don't have the actual numbers, but even if they were once in ten or twenty years, nothing really changes.

> Insurance doesn't have to be for things where most people will never incur the expense. The average time between car accidents in the US, for example, is a bit over a decade, yet car insurance is very much a thing (and not just the legally mandated liability insurance, either).

That isn't the average time between major car accidents. Most accidents are little fender benders that often don't even reach the deductible. What comprehensive insurance is really for is when some drunk totals your car while there is still a five figure car note on it -- and having that insurance is required by the lender. Or for liability if you maim someone and owe a million dollars. But neither of those ever happen to most people.