Has anybody noticed the similarity between Our Favorite Hoax Believer and a fellow who's been posting on Randi's board under the nym ICanTakePicturesOfDemons ? (Yes, his nym is his story -- all of it.)
They both hold truly wierd ideas, are totally convinced of their correctness in the face of universal skepticism, seem to want badly for others to share those beliefs, and are equally immune to rational persuasion.
One difference: ICan's correspondents have been urging him to seek medical attention. They seem to be genuinely concerned that the fellow might be suffering from a real neural pathology, and might even become a danger to himself or others. I can't recall anyone suggesting that about OFHB, though.
The whole phenomenon of Hoax (or Conspiracy, or Absolute Truth) Belief is a fascinating one, though. I know this is not an original thought, but it does make you wonder if the propensity for this is wired-in... a Belief Gene. But what survival advantage could such a trait provide?