As karennj suggests, there is a lot more to breeding than "hey, your dog is pretty, my dog is pretty, let's make puppies". Ethical breeders take into account a very large range of factors, including (but not limited to) show performance, temperament, health issues and test results, offspring from the bitch/sire's previous litters, etc. Ethical breeders research lines for years before making choices. Titan's breeder had his litter lined up for two years before he was born, and chose his sire to match with his dam for very specific reasons. Not just because he was a good looking dog.
Breeding should be done for a purpose. And "to produce pretty puppies and make money" doesn't count. As karennj said, there are enough dogs without homes out there that we don't need other people breeding for the heck of it. If someone doesn't have a *goal* with breeding their dog, such as to improve the breed either show-wise or health-wise or produce good performance dogs or therapy dogs, etc, then they would be considered a byb and should not be breeding.