.....Yes the whole dying fish thing is barbaric and cruel and people who buy these fish are only supporting the cause etc. I am completely against the whole dyed/over pedigreed/genetic mutant etc fish thing.
Ok, so bright colorful fish look nice in your tank but there are already plenty of natural brightly colored fish available so why bother dying the poor little things in the first place? I think people need to be more educated that a. keeping fish is not easy and needs lots of research, b. they are living creatures which although it is debatable how inteligent they are, how many emotions they have wether some species even have pain recepters in them, there is no moral founding that treating them badly can ever be "ok".
I mean you already get platy/guppys/siamese fighters in about every different color, if the species of fish you want doesn't come in glow-in-the-dark form or purple of whatever don't get dye it or whatever. In fact, i believe that the fish's appearance shouldn't even be at the top of your list if thats all you want.
I know i'm just saying what others have said here but i feel so strongly about the topic i just wanted to write it.