To me it is a matter or a pure breed dog versus a mutt. Generally on a pure breed you will pay more and get the assurance that it will prolly not have any major issue
Actually, that's not even a valid comparison. We aren't talking about pure fish and some sort of ugly hybrid. It comes down to fish that weren't cared for and raised properly, and are now stunted with bad body shape that won't grow to adult size and have dark eyes that are too big for the body (healthy discus should have bright, clear eyes, not pitch black). Hardly the same thing as a purebred dogs vs a mutt. More like purebred dog vs deformed purebred dog with health problems.