Not to be heartless, but doesn't the egg quality go down along with quantity of eggs in those older birds. I keep a producing flock, not really all that interested in having a generic flock with poor thin egg whites. I do set those eggs aside to bake with, if I can identify them, but I would not want a flock of them.
I think that while I enjoy watching my birds, my flock. It is the group not the individual birds. I started with dual purpose birds, but am moving more to a egg laying, with a couple of dual purpose birds... and then a couple of batches of meat birds a year.
I like raising my own food.
Mrs K