Not all people go in, for healthy looking fish. They go in, and see a sick fish, and take it home to give it a better chance of survival. If it were not for the fact the white dragonscale CT male with black fins, was not so expensive I would have gotten him!!
Also note great signs of a healthy fish: If in a tank, no other fish is dead or sick. Lethargy being a sign of illness or stress that can lead to illness. I've boycotted many-a-store because of seeing such things, including improper "space saving" sororities x.x
Breed for the breed, not for the money; the words any REAL breeder would understand.
You must know nothing in order to know all, for all is nothing and nothing is for all.