Bob has always said he filed taxes as a professional gambler. In order to do that then the majority of his income had to have been from gambling, not from selling products. I personally don't think there is that much money in it. Frank Kneeland told me he didn't make any money on his book either.
I was curious about book sales so asked questions of both Dancer and Kneeland who were both pushing me to write a book to be published by the publisher for Las Vegas Adviser (can't remember the name). But after collecting some information, as Coach would put it, I said to hell with that. I'm not wasting all that time and energy for nothing. I've given a lot of the information away in the forums.