I haven't read his book, so I don't know how much of a kook or grifter I would judge this guy to be, and I'm always dubious about things, but I try to remember that even kooks and grifters sometimes (not always!) have genuinely useful things in what they're saying. They might not be the best person to say it, and their suggestions might not always be the best way to make use of the useful bits. But just because someone is trying to make money from spreading their message doesn't make it all BS.
(I think I'm mostly agreeing with you.)