Duck eggs are the absolute best for baking. The best cornbread, cakes, pies.... This is because they are so rich. I even scramble them up to an omelet. On the downside, they are messy. They can turn their run into a muddy pit. (Good to know all sides on an argument). And yes, you need more than one, preferably at least a hen and Drake or two hens, so it is a good idea to hatch multiple eggs. (That I'm not an expert on, we just got our little ducklings a week ago). They are super entertaining! We put our in a tub of water the other day and they went crazy! Dunking and swimming and floating it up. Even got mad when we put them back in their brooder. It was hilarious. But yes, I agree that you should find out their reasons for saying no.