Part of the rationale is that this is how you can access updates: I notify my readers when I add a new essay to the book through leanpub: I don't see your addre

Part of the rationale is that this is how you can access updates: I notify my readers when I add a new essay to the book through leanpub: I don't see your address or any other info, but leanpub forwards my message to the book's readers as an email.