Other people have read past Chapter 4, at least in some stages of the book. Pretty sure my editor, Mark Sehestedt, has read the whole thing, as well as the book's proofreader. Chris Perkins reviewed the first draft, as did both my lovely wife and my friend David Silbey, who utterly rocks. And who sent me an email to point out that the list of people who had read past Chapter 4 was woefully incomplete.
There, David. Happy now? :)