Well, to be truly accurate, most of Hahn's books and talks are NOT about his conversion.
We are all free (as Americans) to give talks and write books and make videos as part of our working income strategies, but whether people actually want to acquire them and make use of them is entirely up to the buyers.
(For an interesting comparison, sometime just do a quick search on Amazon for "Billy Graham" books and audios/videos.)
....and we are free to give opinions on message boards too, in case you haven't notice. I am quite sure I never said anything about rights.....