1. how? healthy chickens lay an egg every 1-2 days. a small number of chickens produce more than enough for an entire household. everyone I know who keeps chickens gives most of the eggs away.
2. chickens are the ultimate garbage disposal. you can feed them any excess food from your household and they turn it into fresh eggs.
3. see 1. the volume of eggs gets out of control fast, but not quite on the scale that it’s viable for random people to build an FDA compliant business out of it. it’s hard to get rid of all of them, even for free.