I agree with ptuga completely. I am a breeder as well and I do take special care to make sure my birds go to a good loving home. Usually its a family home with one, preferably more, pet birds. If there is no such home to be found, they stay with me and their family. A couple of times a year some friends and fellow breeders come together to swap birds. This is an easy way to make sure no bird goes into the pet trade but ends up in a nice aviary with breeders who care. Another plus for us breeders is the opportunity to swap genetically identical birds (siblings) and make sure you dont interbreed family.
The 'good' breeders are members of a bird association. This can be the Dutch association of birdlovers or the parakeetassociation. Both require a contribution and a membership of either is neede to order legbands. Responsible breeders order legbands. You have to pay for each legband and you pay contribution. Its not the same as Rue proposed, but I think its good enough.
I know that breeders in Germany are requiered to have some sor of liscence to sell birds. To get the liscence you need to pass a test of husbandry I believe you call it. In any case, you need to know a lot about keeping the animals, diseases and overall health, breeding and such.
I dont take my breedingbirds to a vet for checkups. I do send stoolsamples every now and then to an aviary vet to chek for anything weird. Once a year I select a few birds that dont look very happy and take bloodsamples to be tested on pbfd and such (most of these illnesses only show when the bird is under stress, so taking a happy go lucky looking bird wont do you any good).
The birds get dewormed twice a year. Every day medical care, like infected eyes, mange and such I can treat myself without having to go to a vet.
If you wish to know what my aviarie and my birds look like, take a look at my site (dutch only, sorry, but the pics need no words, right?):
http://maasparkieten.come2me.nl/To compensate my breeding, if you can call it that. I do take in unwanted birds if need be and try finding them a new home. I keep them completely seperated from my own flock in case there are any illnesses.