Costs me $1 a bird and protects the whole flock. There are feed costs associated with raising chicks to laying hens and fertile roosters that far exceed $2 per bird.
There is zero nursing after vaccinating your chicks. Not sure what gives you the impression that vaccinating a chick means weeks...
VET VET VET.
More than once I've had my vet inject calcium gluconate to help egg bound eggs pass eggs.
I have no problem with having a professional inject medication or vaccinations for my birds. Vaccinations are difficult for small backyard breeders as they only come in large batch...