Mainly because they are trying to produce a nutritional but economical product that is commensurate with the value of the animal that is being fed. Most people don't want to pay $50 a bag just for chicken feed. But if you want to they certainly have perhaps tastier feeds that range from $50 to...
LOL, that's just absurd.
If your birds are free ranging all day over a large area with good forage they're not going to want to eat that many pellets. Depending on where you are located, come fall a lot of those food resources are going to dry up and then they will for sure need a more complete...