Can any of the research you've done on RC be scientifically supported? The only definitive research I have been able to find is on captive systems, and suggests that these systems indeed benefit from the presence of these fish. The only studies compiled in nature thus far are in Hawaii regarding the Hawaiian Cleaner Wrasse, and so far are inconclusive until further data can be collected. (If anyone can supply documented scientific information to the contrary PLEASE DO!) Due to initial observations, the collection of the species has been suspended until these studies are complete.
Please be aware that articles posted on RC or any other board shouldn't be taken as necessarily "expert" opinions. Observations by fellow hobbyists should be noted, as well as what environment specimens are being kept in. 15 years ago the cry was out that due to the failure rate we should leave keeping sessile invertebrates to public aquariums and educational institutes. Who would agree with that statement today?
I happen to know a marine biology researcher at our local university that tells me what I am doing is more advanced than what they are able to do in a lab that has a few hundred transient biology students. I asked her about picking up some courses and she advised me that other than the principles of biology, I would be wasting my time and probably feel somewhat underchallenged. She also notes that most of her research is done using dead specimens, while my goal is to keep things alive and thriving.
I am certainly not recommending that EVERYONE go out and get a Cleaner Wrasse. I run a reasonably large system with a complex, mature biodiversity, so obviously it has a better chance of being healthy than if enclosed in a 20 or even 50 gallon system. I would never have considered one of these if I were limited to such a small system and not be sure that I could offer a wide range of biodiversity to offer it's best chance of long term survival.
My Powder Blue Tang is the healthiest it has ever been. The little wrasse has moved on to my Copperband Butterfly which became covered in ich the minute I introduced him to my system. Since he started eating all the feather dusters, (the reason I got him in the first place), and the Cleaner Wrasse started picking away at him, he has come full circle and is totally healthy and eating prepared foods. I am of the opinion that without this service, he may have perished by now. The wrasse eats ANYTHING every time I put food in the tank. He swarms along with the rest of the "school" any time I approach the tank and they think food may be offered. When I have my hands in the tank he always comes up and starts picking at me... I'm sure this isn't in his natural diet, but the behaviour is fascinating. He'll pick away as long as I let him.
In short, please keep the observations coming, the more experiences we can share the better the chances are that we can keep these species thriving in our homes. As long as these specimens are being collected, people will buy them. People can cry until they're blue in the face about reef ethics, but people, most likely inexperienced hobbyists, will continue to buy. Let's use this window of opportunity not to argue ethics, but to learn the most effective methods so we can all enjoy for years to come.