I'd have to read up on their offering. Yea, I suspect you lose out if there is theft or damage. Ideally the terms include some buy-back program using the insurance money.
There was another article we stumbled past today speculating that things like this are going to ruin the art industry. Selling ownership to a bunch of people is going to drive demands for high security. So lock it all up safely... where no one will ever get to actually see it. hm