I don't know about profits, but outfits like Greenfire Farms are achieving similar sales today. In my mind it is a shame that "rare" and "colorful" are more valued than "well-bred" and "productive" today. But the truth is that societal values change, and that crazy is still crazy.
What is important to keep in mind is that folks needed to earn a living off their flocks and paid much more attention than us hobbyist. Many hatched their own birds. Home incubators were a big deal then. They also kept good records and monitor feeds they used. The gentleman in the article mixed his own feeds. Changed them according to the seasons. Checked his housing and space.
Titles of parts of his article:
"Sunlight Means Profit" -
He talks about placement of his coop, ventilation and windows. "The end of the rainbow comes down through these windows onto the floor and this is where we get our gold coins".
"Must Have Clean Litter" -
He talks about the "scratch area" of his coop and the "litter area" as though they are separate places. I think he had dirt floors.
"When the hens are kept in continuously , the litter, which is dry straw, is changed every two or three days; at other times about once a week. Cleanliness has much to do with keeping the hens healthy."
"Heavy Feed Is the Rule" -
"I'm convinced that if a good percent of farmers would sell half of their flock and feed the other half the same amount of feed they would change a losing proposition into a most profitable one. There are as many best ways to feed hens as there are best kinds of cakes. Different successful poultrymen with whom I am acquainted each have their own mixtures of feeds and methods of feeding. Meat by product of some kind are very essential as part of the feed in winter".
There is more on feeding, but to much to type out.