There are many things that the big companies can do so much better than we can as individuals. I would put fish food in that category. My garden, my chickens, and even my fish are a different story. But I couldn't do it without the help of the big researchers.
I'm not a professional, but I've attended hundreds of hours of workshops, seminars, etc., related to aquaculture and agriculture. Over the years I've had the good fortune to spend time with some of the world's top fish feed researchers. Through research grants, I've helped test and compare a number of experimental and commercial fish food formulations.
Knowing what I know now, I don't think I could come even close to producing similarly effective feeds for anywhere near the cost that the commercial producers can provide. Your estimates are based on raw materials. After you factor in the cost of the equipment, labor, transportation, storage, etc., I'm guessing you would be nearly triple the cost of the raw materials -- and the fish might not even like it. A few years back, Cargill found that after lots of research money on one of their game fish food products, they thought they might help change the industry. The problem was that the fish didn't like the product!
Maybe that is like the difference between a heritage turkey and a commercial turkey for Thanksgiving. I couldn't possibly produce turkey's for $0.79 a pound, especially if I included all my labor to make it ready for the oven.
I have no idea what my catfish and big bluegill cost per pound, but it has to compare to, or exceed, the prices for top grade commercially provided tuna, grouper, striped bass, etc. And, that is based on using good commercially produced fish feed.
Good luck,
Regards,
Ken
