@partyparty Any good breeder will tell you that they don’t make lots of money from breeding and selling pups. After the stud fees, caring for a pregnant bitch and then caring for puppies when they are born, a breeder is often lucky if they break even!
It’s because of selective breeding that we have a wide variety of breeds to choose from. Some people don’t think that is a good enough reason but I know that I have my favourite breeds, some of which, wouldn’t be here now if it wasn’t for breeders keeping the lines going. Also, people want dogs for different reasons, some breeds do better in certain situations/lifestyles than other and some breeds are better at certain jobs than others (a Retreiver is a good gundog, a Collie is a good herder and a Jack Russell is good at keeping pesky rodents at bay). All the breeders I know say that they do so to “better the breed” and as @theninth said, well-planned breeding is used to try and eliminate health problems as well as producing dogs that are very capable of doing the job that they may have been bred for.
I don’t have a problem with responsible breeders. I have a problem with idiots that decide to mate their bitch because they think it is an easy way to make money and they don’t bother to get all the relevant health checks in order to produce healthy pups.