Recently, Jose posted:

To be fair to the companies, the risk (for any given aircraft) goes up
(or at least is less controlled) if there are multiple pilots flying
it. If I own a plane and fly it myself, I can get one rate based on
my experience. But if I let all comers fly it, then the special deal
I got because of my incredibly perfect flying ability shouldn't be
expected to hold. I have no control over what the next dolt will do
to my plane, and neither does the insurance company.

Yes, but the insurance company has only one aircraft to repair or replace,
regardless of how many people are flying it. Their total hull loss costs
are fixed. Unlike the income from renter pilots who buy insurance, their
liability doesn't increase in a multiplicative relationship. For example,
if 100 renters' premiums were $1k/year for a $100k hull coverage, there is
no risk. 110 renters' premiums = $10k pure profit, and *each year* that
the plane isn't totalled, the whole amount is pure profit (the numbers
used are just for convenient math).

Neil