The only time I've helped anything out was Sebbies and that's because their shells are very thick. They grew up to be gorgeous, big healthy birds and are doing very well. That said, who's to say that a chick/duckling/gosling/whatever isn't struggling to get out because of human error/humidity issues?
Just a thought...
And as for the other part of your post...
I do see your point and I partially agree with it...but there are some of us who are responsible and do work on "projects" while preserving rare breeds.
I don't sell many adult birds and when I do it's either people who are just starting out (and they're able to take advantage of sometimes YEARS of my work to get a head start on a new variety) or they don't care about type/showing and/or don't want to breed (just want eggs or Sunday dinner!) If a chicken is way off in type/color/temperament it's off to freezer camp and I don't sell those.
I realize that some people are not responsible breeders in many animals--dogs, cats, horses, children (LOL job security for me) but you just have to make the decision to not contribute to the mess. I sell hatching eggs to just about anyone who has money to buy them and sometimes to people who don't (I trade a lot). I only use the best breeders in my own breeding pens--but as for what these people do with the chicks they get out of my eggs, it's their choice and once they leave my farm, I have no control over the future birds or people's breeding choices.
Lastly, I wouldn't worry about it too much...those of us that breed responsibly and keep good stock will always "outshine" the backyard breeders in terms of type & quality. People who want a show bird or just plain nice stock don't go down to the feed store & dig chicks out of livestock troughs.
Look at hatcheries. Do people buy from them? Yes...millions of chicks per year--do they always have the best examples of the breed, no. What happens to all of the unwanted roosters from those hatcheries? Or the roosters that aren't sexed correctly and go into the city somewhere? If you just wanted a pet or a few chickens for eggs who cares what they look like? And they all taste the same.
I think there are enough different people & "mutt" chickens to go around that it may be an expanding issue but like most other things in life, there's not much you can do to control other people's actions...you can only learn from your own mistakes, try like heck not to repeat them and strive to better the breed you're working with and hope that others will follow in your footsteps one day.
Just my opinion.