I've ordered eggs from several places, knowing the risks, and honestly I've been impressed with the various packing methods I've seen. I did receive some broken eggs once, but the eggs had been packed extremely well; the box was stamped fragile a thousand times; it's just that in shipping the post office had actually punctured the box with something. There was a huge hole in the side. The eggs beside the hole were broken, where whatever it was went in.
This is nothing the shipper could have foreseen or have helped, even if he'd foreseen it. And since he'd sent extras, anyway, I ended up starting with the same number of eggs I'd ordered. Almost all started developing, and most hatched... even considering they all must have had terrible handling, as was evident from the box.
Personally, I think most people who sell and ship hatching eggs have a genuine interest in getting you a viable, fresh product. We all know that the post office can be vicious, whether the eggs are well-packed or not, and that eggs can be damaged whether or not they're broken. And we also all know how touchy incubation can be... we've all seen the incubation threads in which a temperature spike, a loss of power or a problem with humidity has caused the loss of the eggs. That's all independent of what the seller can control.
I think if you have an honest, good relationship with your seller/breeder, you can still work together to get a good hatch, and honestly, I think most of them will take pity on you, too, if you've had something horrible happen. That doesn't necessarily mean they're going to re-ship more eggs for free, but it may mean the next time you order, they'll send EXTRA extras, or maybe just give you some good advice as far as your incubation methods go. Most chicken addicts like to see the addiction spread, after all... !