um... there's no difference in taste or nutrition between a fertilized egg and an unfertilized one... unless you incubate them. if you're worried about the red specs sometimes found in eggs, that is entirely dependent on the girl and whether she's 'leaky' when she ovulates.
Yes, I totally understand that but customers are picky and repeatedly state they do not want any surprises. It's just easier to tell them there are no roosters so there is no chance of surprises. People want what they want and they don't want a science lesson when they buy eggs. I'm not really sure why my husband doesn't want roosters but he is pretty firm on the matter. At this point I really want to keep them, I just have to separate the breeds that have roosters from my laying hens. I have plenty of room to build multiple large runs and coops I just have a limited budget.