Dry rock has many advantages over wet live rock. For starters, it’s significantly cheaper to ship. Dry rock doesn’t need to be shipped overnight like live rock. Because dry rock has no living organisms on it, there’s no need to worry about keeping anything alive during transport. Additionally, when you purchase dry rock by the pound, you aren’t paying for water weight. This means you get more rock for your money, and given the fact that it is usually cheaper anyways, you’ll probably get far more than you thought.