I agree with Simon in this case.
BTW, I remember the original CoC wasn't cheap and few non formulaic books are super cheap simply because they are e-books. Schlock is free or cheap. Whatever the opinions about Dykstras timing, it isn't schlock!
Terry Walstrom is selling his ebook for 9.99. So is Lloyd John cedars. We should get kindle unlimited if we want to borrow them for free. I love ebooks, but I'd want that one as a hardcopy, personally. Novels and some memoirs can be e books,but I don't like reference material that I want to keep in that format.