I wonder how many people do something similar on a smaller scale. Someone made the great point above about average egg production being much higher than 100 years ago, requiring a better diet....but how bad a drop off in production (and bird health) would you see if you fed by going with a mix of free ranging, access to active compost piles, and food scrap?
For more than a few birds, it's unlikely one family could create enough food scraps on a regular basis, but by collecting scraps from friends, family, neighbors, co-workers, or local restaurants or grocery stores, I'm sure it would be possible to get enough.
I guess getting the correct nutritional mix (enough protein, for example) could be a challenge?
If you have a good forage base the egg production can be very good. Problem is most folks are not considering how to promote quantity and quality of forage.