It seems that the resort is a very popular destination for the Israeli Orthodox Jewish community. The equipment rental shop has had an ongoing issue where the Israeli tourists were not bringing back the equipment. The shop got irritated with the recurring problem and decided to not rent to them anymore.
I live in a ski resort town. Tourists suck, it goes with the territory. It seems like the better solution would have been to pre-approve a deposit on their credit card. If they fail to return, they become the proud owners of a grossly overpriced used piece of gear.