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?
You forgot the biggest impediment. Foxes and or coyotes. Doesn’t matter if you are in the middle of suburbia they’ll find you.