Haha. The stud muffin around the place... I love it. Lol. I'd say go for it, but if you plan on keeping 10 ducks (and want fertile eggs), you might want to get 1 or 2 more drakes. Roosters can handle a lot of hens, but drakes tend to handle less ducks.
Depends on if your birds are related or not. Say you have a brother and sister right now who give you chicks and ducklings. Then you get inbred babies from them, and then they're inbred again when the father mates with them (obviously your Pekin and cayugas aren't related). And like nivtuck...