The labour and land step up from tending chickens to growing grain is a very large step. If you are organized enough to grow grain, and you're near a farming area, you'd be farther ahead to try to buy right off the field grain at harvest time for cash. Mechanized grain harvesting is an immense labour saver that is unavailable to people growing feed for backyard chickens.

It's two 40lb bags. We don't have enough square feet to grow that much feed per month (and still have room for the other stuff we grow).

I don't know how accurate this is, but there was a youtube video from some homesteader I accidentally ran across saying you can ferment the feed to a mash, and the chickens will eat/need less.

How much land would you need to grow that much grain? Probably a lot more than most backyard chicken flock owners have.

Chickens will eat grain, but the best eggs (and healthiest chickens) come from lots of protein and green leafy matter. Vermiculture and simple insect attraction methods like maggot buckets, food scraps, and lawn/garden waste can go a long way with chickens.

I don't think they get a lot of calories out of greens, do they? I feed mine all sorts of scraps, but they also eat a lot of grain.

"Around here our eggs are averaging about $9 per 12 on the shelves, "

What state are you in, that's crazy pricing. Article says, "Last week, the average price of a dozen eggs hit $4.95 per dozen—an all time-record." So you are stuck 2x the national average price.