I used to raise my own.
I now buy 16-18 week old pullets for my layers from a local farm.
The cost comparison is about the same. I will pay $6.25 for these birds and they are Golden Comets.
If I raised them up to this age, that is almost exactly what I would have in them.
It is a catch 22 when truly pricing animals. You must do it correctly.
Your time from ordering an egg and hatching it, your gas to go to the feed store and buy supplies, the electricity used in bators, etc. etc. bags of feed, meds, etc. etc. Every single cost should be calculated to know what you have in those chickens. Then you know your true cost. So many do not calculate the true expense of their business--(if it is a business truly).
There is a breakpoint usually on all animals and where their feed to growth ratio etc. is not worth keeping them and it is time to unload. I don't have a clue what month a chicken is old enough to be the best sell time????
Where did you hear that? Can't you get the extra info to see what the true info. was and see how it was explained? Cause I would like to know too...LOL-LOL