Murph, thanks for your imput. While I do agree that experimentation is important, I do not think that the average hobbyist should be experimenting with these species. They are far too difficult. This hobby is no longer a hobby where little information is known. Corals were on lists like these years ago because technology could not provide the right things for the corals. Now, technology allows us to have 1000 watts of light over our tanks if we want to. This hobby has come a long way, and these species are still pretty impossible to keep. When experimentation is done, I would rather it be done by people who have the INTENTION to experiment and try to be able to keep these species - rather than the person who goes to the LFS, buys a sweetlips because it's "pretty", and then when it dies, they finally learn why it died.
I wrote this list because I want people to be more educated. If they know about the fish and still decide to try it, well, at least they will know that they have a challenging task. Then, when it is alive, they can come on here and tell us about it and then maybe we will all be able to learn from the experience.
Besides that, there are tons of fish on there that are on there because of their own characteristics. Nothing that the hobbyist does will make the panther grouper, emperor snapper, lookdown, or titan trigger grow smaller, keep the boxfish, soapfish, or cowfish from emitting their toxins, stop the scorpionfish from being poisonous, clam the aggressiveness of the remora shark, etc.