Like Ian- here in Australia I do very well selling ducklings young pairs and fertile eggs. In a good spring I can sell enough to feed the entire flock - pay for all their food and bedding - ( and frozen peas
) electricity for the incubator and lighting for the brooder even the petrol and entry fees for the shows I go to for the whole year. What I make in the other 9 months is all profit. I have show quality birds of a very rare colour- so being able to sell an adult bird for $100 and eggs for $40 -$60 a dozen it adds up very quickly. I also sell at Auctions twice a year, breeding up a range of age groups to cater for people wanting ducklings- as well as those who want more independent older birds.
Ducklings and eggs are priced very differently over here though. With virtually no large hatcheries- and not being able to ship through the post, demand is very high for just about any surplus a breeder has to offer each spring.
My ducklings start at $20 each from a few days old, That is where the best profit lies as the costs are so few.
Selling eggs when I have 6- 7 females laying at a time is easy - 2 dozen every Monday can be posted if you allow for those too dirty, misshapen or too small and still leaves me with plenty to hatch for myself. But with only one - people are less likely to buy the eggs for hatching. Its also very important to test the fertility of eggs. Hatching your own at the same time as selling - I always know how good the fertility of the eggs collected are.
With only a small number you would really struggle to even break even with a breed that hatcheries can supply with the prices in the USA. Take into consideration that you have to feed and house the flock year round, before you can say that it is making you money. Going for a pure rare breed will increase the demand for what you have- otherwise people are just going to take the easy way and go to a hatchery. People are also spoiled for choice. At a hatchery- you can sift through the catalog and choose two of this- two of that and six of another and choose what sex you want them.
Selling some eggs and ducklings is a good way to reduce the costs of keeping them though, even if they dont bring in a profit- contribution is still good.