Haha! Definitely true about the health tests, I have even done that with Anna and she gets flying colors across the board.
Fish have health issues too, bent/deformed spines, short bodies and ocular impairments in dragonscales. I would never breed a betta with a deformed spine because that would be inherited into the next generation at a higher rate. But of course they wouldn't test for genetic diseases, how would you test for it anyways? It would be a pain to get a blood sample from a betta or get an x-ray LOL
I love breeding for show, its just my hobby because it gives me a goal I can go towards. I love having goals, it keeps me focused. But you are right, the majority of people want a good-lookin pet, that's what my friends want. They don't know what a breeding quality betta looks like and if I begin to talk about the conformation of bettas they look at me like I have grown a second head.