Nope, not comparing to hybrid sex links. Can't stand those birds. I'm comparing heritage lines...those developed by a breeder...to those "heritage" type breeds sold by hatchery. The WR hatchery stock I've had lay like a dream, all seasons, and for years and can put a person ahead of the feed bill every day of the week and twice on Sundays. The BAs from the hatchery even better. What I've read about and what little I've experienced with the heritage line breeder quality WRs is that they think it's good laying to lay 4-5 eggs per week in peak season. That, to me, is not good laying. Maybe I've been spoiled by the hatchery stock I've owned but one most certainly can turn a profit on a laying flock, even today.
For instance, in 57 days my teeny flock laid 347 eggs(9 laying age hens, though not all are laying all the time and some not at all) and in that time I've bought one $10 bag of layer feed and still haven't fed it all out. If I sold those eggs~which I can do easily in these parts~for $2.50 per I'd have made $30. During peak season that can go on for some months. Those 9 birds plus a rooster are down to eating about 2-3 c. of feed now due to the forage being so high and that will continue all spring until fall, with feed consumption dropping all the while~but the laying won't diminish until the birds start to molt. Last year I was feeding a cup and a half to 14 birds in September.
If a person cannot turn a profit on laying birds then they might want to look at their methods. Free ranging, fermented feed, keeping only good layers, intentional planting of quality forages and arranging foraging opportunities that include high protein intake, etc.
I've heard it said on this forum over and over that one cannot make a profit but I manage to do it year after year with very little effort, so all I can figure is that folks are working hard but not smart or don't know how to raise animals on the cheap. They don't need fancy buildings nor fancy equipment and they certainly don't need high dollar feed to produce an egg.
You have managed your little flock well. Many could benefit from some of your ideas.
However, I am still unable to see where you have made a profit. Then there is a conflict of sorts.
You say 5 eggs per week is not enough, but that is typical of the hatchery stock less the commercial strains. That is also the average that you gave above.
I am skeptical of the claims that the show strain Rocks averaging 4-5 eggs per week. It is more like 3-4. Then they have seasonal slow downs, take forever to molt, take for ever to come into lay, come back into full lay late in the season etc. I am sure there is an exception out there somewhere, but I have tried them. They eat way too much for what little they produce. The only thing I think thy are useful for, is the show cage they are bred for. Then possibly to improve the type and carcass on the hatchery "version".
In fact that is what I would do if I was interested in the Whites.
Where I do not see the profit is you are describing a very short interval in time. If it is recent, it is during peak season. What the numbers do not take in consideration is facility depreciation, the cost of accessing the feed, and labor. You could not convince me that in those two months that your time and effort was not worth the $15 per month.
It also does not describe the cost of replacement or establishing the flock.
Then to actually attempt a profit, you would have to scale up in a large way. The labor would increase, and you would be able to rely less on your forage. The forage that would not be there at all in the coldest days of winter.
You are not describing a profit, but you are describing excellent and prudent management.
Second to genetics, performance and efficiency depends on feed and management most. You do have reasonably efficient layers (genetics), and manage them well.