Doug and I have decided we wouldn't last long in a large hatchery operation. We worry too much about the little ones causing us to check on them constantly.
For instance, we thought a couple of the chicks were taking too long to completely hatch out their shells, so we assisted them. We found part of the problem was the humidity was not high enough, and the membranes of the eggs were drying causing the chick to get stuck. (The low humidity might have been because we were constantly opening the incubator to look at them...)
Because the chicks were stuck, part of the egg shell and yolk sac were matted to their feathers. We decided they needed baths in order for them to fluff up.
Luckily, we had a couple little people very willing to help bathe the babies!