I do not understand the mathematics behind the dilemma. I'm assuming only the firts chicks cost money, because down the line they will breed.
But feeding them, housing them - vitamins and doctoring costs a lot of money.
So anyone with couple or more chickens - how much does it cost to have them on the table? And realistically how many eggs do you get?
Had some friends that tried doing that about three years ago. They finally gave up (and moved) recently.
Gave away their 15-20 chickens, coop, fence, etc. IMHO, they are much happier now.
The cost of feed, mite treatment, lice treatment, bedding, vaccinations, etc were much higher than anything they claimed to "save". And that's not counting all the time and labor they put into it.