yeah... nobody ships in water. one, it's too heavy, and two, you need a biofiltration/oxygenation system on the shipping tank to keep things alive. Like they do for live lobsters. but you know how much lobsters cost per pound. Right?
live rock left in water without filtration goes dead in a couple hours from oxygen depletion. and then rots. which is why they are shipped damp, wrapped in news paper, and air to keep most things alive, except sponges.