Of course I've done the math.
If one is in this only for the eggs or you have an egg business that nets amounts of money that truly make it worthwhile, say 25-30 layers or more, producing $40 a week in sales and if this money is really important to your business or family's economy, then having the super layers, fast to lay, and lighter on feed hybrids is the way to go.
However, if eggs only really "net" you, not gross sales, but net $15 bucks a weeks, say $1 profit on 15 dozen eggs sold, then it just wears you out after awhile. You can only sharpen a pencil so many times. Crunch the numbers and be serious all, and I do mean all, true costs and margins and ask yourself if working this hard for less than a buck an hour on the egg hamster threadmill is really worth it.
To some folks, perhaps it is, so I judge no one.
Anyhow, I've "done the math" on the whole egg sales things for years and years. A few years, I decided that as I got older, the answer for me had changed or evolved. I have tilted much more to the enjoyment and satisfaction side of this. Heritage birds produce good poop too, so the gardens don't care. LOL Live birds constitute a much large portion of our farm report and true bred birds return pretty good returns on that score.
My values/goals today are not what they were even 5 year ago. I mostly want to look at gorgeous birds the rest of my days on this earth. It is just a simple pleasure. Time in life kind of thing.
That is my personal story. Everyone has come to their conclusions about this keeping of chickens.