Personally I don't have a problem signing this type of clause, since my understanding is that my own insurance policy would cover if they damaged the boat. The way I see it, there are some very expensive boats out there, and if the yard dropped one and had to pay, haul-out rates for everyone would go up higher than they already are. I would rather absorb this risk thru my own insurance than pay higher rates to cover risk of damage to someone else's flash yacht.