.... With rentals, I'd suspect damage rates are much higher because many renters probably don't care as long as they think they won't have to pay for any damage they cause. Just a sign of the times we live in with a much lower ethical quotient than decades ago in a long list of ways beyond skiing and that especially is true with considerate attitudes of personal responsibility. Ski rental businesses could make a dent in those attitudes by requiring a deposit and on their contract listing what types of damage and how much a renter might be liable for plus offer modest insurance.....
I'm aware of some skiers who want to ski terrain with exposed rocks/ledges because it's fun terrain, but they don't want to ruin their own skis and forgot to bring their rock skis. So they rent.
For them, rentals = rock skis.