Our forefathers didn’t have a TSC to go buy feed, yet they managed to keep all their animals through the winter…
100 years ago farmers struggled to get a then-profitable 100 eggs per hen per year -- from Leghorns. https://www.backyardchickens.com/threads/poultry-for-the-farm-and-home.1443907/
I had a Brahma, the worst layer in my flock, who did better than that.
We do not have our forefathers' chickens.

But if you do manage to reduce your inputs far enough the reduced production *might* yield a net profit. There was a member a while back who was in a very favorable climate who managed a semi-feral flock of game chickens with near-zero input so the eggs he got and the meat he harvested (with a shotgun), were pure profit to him.
