I agree that Icke isn't a "con man" as such.
L Ron Hubbard was in it for the money, he never believed what he was saying. Icke suffers from the need to be the centre of attention. From goalkeeper to sports presenter to Green Party spokesperson he was always watched and admired. When this all went away he came up with the "son of god" predictions of world end stuff. Since then he has completely changed his story a couple of times to create new media interest because he wants to be looked at.
I think Icke is more like Paris Hilton than he like most of the the woo-woo brigade that are discussed on this board.