otoh Hertz have twice billed me for damage I definitely did not cause. In one case for a scratch on the front air dam that you had to lie down under the vehicle to see (which their agent in fact did when I returned the car). So now I use Avis.
90% of their fleet at that location might sit unused for a week or more, and most of their rentals are steeply discounted from the standard rate - but that car you backed into a pole? Why, that one would have been earning them the standard rate, every day.
I'm not sure how they handle cars damaged under those sorts of policies. I do know those policies are also wildly profitable (I've never come close to approaching eqv. $7300/yr for insurance, despite a horrible driving record when I was younger). Rental cars don't even crash 1.5x as often per mile, so a 5-20x multiple on your premium is noteworthy.
The coverage you buy from the rental company is a massive rip-off, that's why credit cards can offer it for free as a perquisite.