The less you show your readers, the more money you'll make. If you want them to spend on advanced chapters or books, you probably want them to anticipate what they are going to read. Readers spend money thinking of what they are going to read in the next page. So, you want to foreshadow, to titillate their senses. You don't want to have everything here and now. It's hard to master the art of the keeping the goodies in the shadown, but Readers are most attracted by what they think they will see next, not what they are seeing right now.
That is probably something I'm still lacking myself in my writing. I've learned a bit about Less is more and Readers are most attracted by what they think they will see next, not what they are seeing right now from Dan Brown's masterclass, but never like in that moment I understood the value of chaos, of a character escaping your control. See, I've always considered myself more of a psychiatrist for my characters than a all-powerful God; I was drunk on the notion that I was just getting their tales and writing them down. But I think that has not been the case until now. I think that so far, I've written down what I liked about my characters, not what they were really telling me. I think that, as the most insidious and dark among therapists, I was guiding their choices to reflect my beliefs.