There are, however, three possible upsides you are did not address.
1. The experience of writing what you know down in an organized form is an excellent way of refocusing your thoughts. (OK, you do so much of that anyways that this is not an issue.)
2. An increased demand for your consulting services can result in an increased rate for you.
3. The feedback you might get on a book could make you think of things you have never thought about.
Writing a book is probably not going to increase the high-end demand for Patrick's work, which is where his money is at. He is already turning down work from clueful Patrick-hour investors.
1. The experience of writing what you know down in an organized form is an excellent way of refocusing your thoughts. (OK, you do so much of that anyways that this is not an issue.)
2. An increased demand for your consulting services can result in an increased rate for you.
3. The feedback you might get on a book could make you think of things you have never thought about.