I saw that in Smallholder magazine about not selling fertile eggs ......I do wonder who comes up with these ideas and puts them in magazines etc.  I have had no end of new hen keepers ask if this was true, as they had a cockerel running with their hens.  I am pleased they retracted what they said!!
I have had my free range hens, and been selling eggs since I was a girl - so thats over 35 years.  I have always had cockerels with my hens, and sold the eggs.  I have eaten the eggs myself all these years too.  I certainly would not take my cockerels away!!!
Its not as thought I have hens sitting on the eggs a week and then sell them, is it?  In fact, my eggs go so fast, they have no time to be fertilised.  Sometimes, I get them straight from the nest to give to customers 

I do get annoyed at some of the things we are told to do/not do with our livestock.  I am all for being careful with selling to the public etc.  but I think the fertilised egg business is taking things a bit too far.