I do not buy insurance when I ship reptiles. I've done the math, and it isn't worth it (no basic insurance is, overall). If a person loses enough animals in shipping to make the insurance a good financial bet, then that person just shouldn't be shipping reptiles.
I pack healthy CB animals in the very best way possible, and only ship to FedEx Ship Centers (also inaccurately called a "hub"). Those are better ways to minimize risks than to buy insurance.