If you like listening to music, it's well worth the read. You'll start noticing quite how many popular songs stick to the rules they outline in the Manual.
It's also a really interesting historical document of how the industry operated at the time, with a few nice tape-reels-and-fun-old-tech thrown in.
In fact I used to deliberately play off contrasting formulas just to challenge peoples perceptions of what music they like or should expect from a specific genre. I'll be honest, sometimes with little success. But enough times I'd create something unique and engaging enough to make the failed attempts worthwhile.
I wish I still had the time for all this, but it's really an all or nothing passion; you really need to dedicate your life to it otherwise you're never going to be happy with your output (particularly if you're hypercritical of your own work, like I am). Sadly my wife doesn't share the same passion, so it's hard to justify spending weeks locked in my modest home studio. So these days I just produce the odd novelty record for NYE house parties, friends weddings and such like.
Heh, I think there are few people out there who think differently :)
For me, I'd love to have a couple of hours every day that I could dedicate to getting my piano playing back to the level I was 15 years ago. C'mon passive income!