With respect to Bossroo's original question:
This year I'm putting some garden space into chicken feed experiments. I'm putting in quinoa and amaranth (high protein grains) along with lots of greens, beetberry, flax. Also starting some worm bins to keep up their protein, and I can collect seaweed for minerals from the local beaches, grind fishmeal for them from my weekly fishing trips. This is for layers, but I've also got some turkeys on order, so we'll see how they do. If the experiments work well, they'll be expanded for next year. The cost of seed for this project, which I am calculating will yield at most 150# feed, was about $20. But, it's still a pilot project, you know? I don't expect it to be the world's most efficient thing at this stage. I just want to see if it's possible or feasible, I can optimize costs later through other means (seed saving, supplement with drop fruit from the orchard, etc).
Ever since I started buying my own groceries, I realized that I could grow my own veggies and fruit for 1/5th the cost of buying them at the store. That's organic, vine/tree-ripened, clean, heritage breed fruits & veggies, picked by non-exploited volunteers (OK, me and DH), compared to the cost of pesticide-drenched commercial varieties picked green by someone getting $8/day and ripened in a warehouse with ethylene spray and shipped to Mall Wart. Commercial tomato cost = 5X my cost of growing an even better tomato. Easy decision. I get decent cost-effectiveness out of the layers as it stands, much cheaper to raise my own eggs (even on organic feed) than to pay $3/doz for 'em. Buggered if I know why anyone pays good money at the grocery store for veggies, when they've got a yard.
I don't really trust any commercial food processors at this point. Every day there's another Salmonella / E. coli / melamine / lead recall, and it's always flippin' HUGE because no one ever tested anything while it was still sitting on the receiving dock, they just passed it along. I realize there are some good and conscientious folks out there, but until they start policing their own or letting me inspect myself...nuh-uh, think I'll pass.
Nature may have created some nasty chemicals out there--Angel of Death mushrooms, ergot amines, botulism toxins--that doesn't mean I want the stuff sprayed all over my dinner plate. I suppose growing things "organically" seemed obvious to me simply because my Mennonite and Amish relatives have been doing it for centuries. I can see how it's difficult to understand, though, if you've been taught to farm by the agriculture colleges and from relatives who have been farming by the Better Living Through Chemistry method, and you've only ever bought your food from the store. I've had lots of people tell me that I can't possibly be a locavore in the NorthEast without getting scurvy/rickets/pellagra in winter, that humans can't survive without orange juice, all sorts of weird stuff. It helps a lot if you personally know many people who live exactly that way and are perfectly healthy and even make a decent living farming like that--if you don't have ANYONE you know who does that, then everyone acts like you're insane, and you wonder if maybe you are crazy after all. It's different when you say, "buddy, my cousin does this and it works great for him, he made (however much) last year, I'm gonna give it a try myself."