Dear Marketing Executives,
Just because I like Lord of the Rings and occasionally purchase books from the Science Fiction Book Club doesn't mean I believe in crystal healing, or finding a best friend with numerology, or cleansing diets, or any of the other wacky things out there.
You know those books you can get page by page. The pages are cards that you collect with hole punches in them, and you are supposed to put them in the special binder you get if you subscribe to it. It is just another way to "monetize" content. Sometimes it might be interesting if it is about a TV show and has pictures and bios - that is, if you are around 12 or so.
Other common ones are recipes. These are a little more useful.
I got a sample pack recently of something to do with spirituality. It got thrown away before I could get a good look at it, but I got an interesting impression.
People crave spirituality, but they don't want the discipline of honest inquiry; integrity; and moral, reasonable, or common sense action.