i have been getting roughly 50% Dark chicks to hatch from the dark males covering the WLR females. Even though the WLR is dominate, those hens are already half Dark.
I will not sell any eggs until fall and laying picks back up, and I'm betting by then- the old hens will be molting; so until this new crop of pullets starts laying good- I'm thinking won't be much to sell over the winter.
I may sell some pure Dark eggs when I start selling again. I think after keeping this batch of dark pullets that I have now- I'm thinking that will be plenty for awhile.