I don't get it, why do this, when you would just insert a pamphlet of an ad between the pages of each book (as a bookmark) or put a single 4sheet of ad between

I don't get it, why do this, when you would just insert a pamphlet of an ad between the pages of each book (as a bookmark) or put a single 4sheet of ad between the pages as it is bound? Both would be unacceptable to me, but at least it wouldn't be AS horrifying as literally editing the text and putting product placement in between the story lines. there is evil and then there is stupid.