Wow...That's really impressive looking Gonk. Even though I would feel I'm part of the population that knows something about how to set up a home theater, I'm sure I could learn a few things from a document like that.
My only addition would be a chapter on "Tweaks". I know I can get in trouble around here for saying something like that

but I think you possibly address topics such as power conditioning and acoustical treatment. Maybe you could call the chapter instead something like, "The Inevitable Upgradeitis - What comes next."
As for payment, if you've invested this much time in such a document, then a small fee may be applicable. The problem, however, is that you know somebody will eventually post a copy online. It might be better if you instead include the document on a DVD/CD that includes some of the other tests that you've developed. That way you're selling an entire package and not just a document. Just a thought...
Again, WOW!