Yikes, that's a bit harsh, AJM00001!
We've been doing this for about four years now, and have helped hundreds of people personally. We have an active member community where many people report total clearing of their skin by following our methods.
We talk about chlorine and fluoridated water as potential acne triggers in our book. In our view, acne is caused by three factors - diet, environment (toxins, etc.), and stress. We talk about all these in turn.
We talk about individual food testing, because we understand that not everyone reacts to the same foods. For some folks, dairy is totally fine, but others break out the next day from drinking milk. Some people tolerate raw milk, some people don't. Sounds like almond/cashew butter is a trigger for you, AJM. We've had people who react to pineapple, bananas, citrus, FCLO, all kinds of weird stuff I wouldn't expect - which is why we recommend that people test foods on themselves constantly (as I do as well).
From a personal perspective, I think acne books can be a great deal of help to folks who are struggling with acne and aren't getting any results from the standard dermatologist-recommended approaches. Acne Einstein, The Love Vitamin are another two great sources of information. Our readers have told us many times that we knew way more about the causes of acne than their dermatologists ever did. I'm not saying that's true of all dermatologists, just that it seems to be a trend that our readers have reported.
AJM00001, it sounds like you've got a lot of individual/specific food triggers - I totally respect that! Saying flat-out that acne books are useless, though, is a bit of a generalization. For me personally, the standard "common wisdom" treatments (BP, SA, washing face, etc.) did nothing. I was only able to clear up my acne when I started following Loren Cordain's The Dietary Cure for Acne back when I was in high school, and have refined those methods a lot through personal experimentation and further research. Yes, we do run a business. Is that such a bad thing? Businesses are built on value exchanges. Running it as a business allows us to work on it day in, day out, refining our methods, updating the book, reading the latest research, etc. There's not a chance in heck I would have time for all that if it wasn't my job! And that allows us to help a LOT more people than if were just doing this in our spare time.
EDIT: @AJM00001, I just added a bit to that peanut butter article to reflect your situation (i.e. reacting to almond/cashew butter, but not peanut butter) and further stressed that people experiment on themselves with all foods to really make sure. You're right, we can be a bit cut-and-dried sometimes - I will work on that.