As an owner, I was at one time foolish enough to allow my R22 to be used for engine-offs at a time when others on the flight line specified no full-down autos.
Because of the lack of restriction my utilisation was high, but I didn't get much sleep. Cack-handed, heavy-footed students (and instructors) were battering my little ship on the ground, day in, day out, and to what purpose? The full-down auto is a party trick, nothing more.
Even if the machine you're about to fly has no obvious damage on it, do you know how it's been weakened and compromised by the kind of treatment you wouldn't visit on an agricultural tractor?
It's increasingly common for owners to specify no engine-offs in leaseback deals. I do.