I've known 3. One (would be in his 80s now) was a reasonably intelligent guy, but really self righteous. The next (would be late 60s) was really self centered, and was considered by the rest of the elders to be an idiot. He thought a lot of himself, but definitely wasn't all there.
The third is a kid that'd be maybe 26 now. Total moron, one of those people that would have no value without the cult. He pioneered and started partaking at like 19. Complete buffoon, this kid. Again, he thought an awful lot of himself. I think that's the common theme.