I've been discouraged hatching shipped eggs as well. My first hatch came from Utah to New Mexico, so they didn't travel far, and 8 of the 12 hatched. The chicks were cute, but not the quality I was hoping for. I got nothing that I could use to start breeding.
My second batch of eggs came with all detached air cells and nothing even developed from those eggs. So the seller sent replacement eggs (really nice seller), but 2 were broken in transit though they seemed really well packed. Two developed and hatched, but still not the quality I was looking for.
My fourth batch of eggs, I bought 6 and the seller sent 11. They came all the way from Indiana, and must have had a rough trip. They were packed beautifully, and all arrived with air cells intact, but only 3 developed. One baby hatched, and she's sitting on my shoulder as I type. I think/hope she's the quality I've been looking for (hard to tell at 6 weeks old), and I plan on getting more eggs from the same seller, but she's had a roo in with them right now that I don't want chicks from. Hopefully 2-3 weeks from now after the hens have been away from the roo for a while, I'll have a broody hen and can get the eggs I want. If I can just get a cockerel from those eggs, I should be (hopefully) set to start hatching my own.
So for $68 worth of eggs, I've gotten 11 chicks, one of which is the quality I want. But I've got good broodies who will help me hatch out more babies, and some cute eye candy running around the yard.
I've got my eyes on a breeding pair that would have to be shipped to me, and they'll be $100 plus shipping. I'm about to decide it's worth it to buy them!