I'm just starting to set eggs now. We are in northern Minnesota, so it is not practical to ship until April or May because of the cold. Even at best, hatching shipped eggs is risky business. That is why I charge only for eggs that hatch. So much can and does go wrong. I think the biggest hazard is that the air cells pop because of the air pressure changes on the planes when being shipped by air.
I am a bit touchy about extending any credit while waiting for the eggs to hatch, as I did get stiffed by two people last year, even though they did have eggs hatch.