Include a few props, scene files, some materials, etc, as part of the examples in the book, sort of the way that Vue has example and tutorial files, and you could be in business.
To maximise your market, you should divide the book into Beginner, Intermediate and Advanced sections.

The beginner section would be for a total newbie. How to install, what goes where, what each room does, how all the controls work, how to set up a scene, dressing a character, apply textures, etc.

Intermadiate should cover things like using python, animation, firefly settings, lights, material room functions, conforming, morphs, etc.

Advanced should cover things like ERC, JCM, clothes creation, poserizing a model, setting up an animatable figure, writing python, exporting to other apps, etc.

That's just a rough idea.

If someone, like ynsaen was prepared to head up the project, and do all the editing and administrative work, we could make this a community project, and get various people to write various chapters, (like I won't be writing the Python chapter, but I could write a chapter on Poserizing a 3ds model). As long as the person who was making the profit was selling it really cheaply, and did enough work on collecting all the information from various people, getting permision to include tutorials, etc, I wouldn't mind doing this for free.

Obviously everyone who contributes gets the book for free!!!!

Just an idea.

About time we had a community project going.