The reality with online groups is that no one really knows if someone is sincere, or a salesman or mentally ill! We are stuck with the limitations of our method of communication.
Most folks know not to base their treatment on a discussion of success stories in an online group.
Where such groups are quite useful is in passing along information--leads about things that might be useful, links to more information on ***why*** something might be useful, information about things that can be harmful. This is especially helpful considering the state of medicine as you alluded to in your post.
Cutler is rather straightforward about how he thinks chelators work and why people should do things one way or another. No one is asked to put their *faith* or *belief* in him. They can just read his explanations and make their own decision. These are some examples of some of his explanations in online posts. Of course there is more in his books, etc. http://onibasu.com/archives/am/53055.html