There is always a chance they are not infected, but it's a small chance. They may never show clinical symptoms, but they have most likely been exposed. The virus is easily carried on your clothes and shoes. As far as hatching, the eggs themselves will not be infected, however, once they hatch they will be immediately exposed to it if they are in the coop or with infected birds. You will be probably stuck like I am with hatching in incubators in the house. The ones I hatched this year were kept in brooders in the house. I vaccinated them as chicks and had them under strict quarantine for 10 days following the vaccination. Their brooders, lights and dishes were sanitized. When I went to the coop, I left my shoes outside, changed my clothes and scrubbed my hands before going in to where the chicks were. Some people just take their chances and hope it doesn't manifest itself again. However, it is not fair to take the birds to a sale and risk everybody. If you need to get rid of some, advertise in the paper or on Craig's list. Be totally honest with anybody responding to the ad. Most people buying roosters are buying them to butcher. They may not care if they are going to be killed immediately anyway. The meat is fine if there are no clinical symptoms. You could also find someone in your area that butchers and have them butcher the chickens for you and put them in your own freezer. Sorry. Marek's is a real bummer.