>>I understand you are sincere in this question, but I think >I was just playing with some numbers in my head and they are probably all wrong but let's say there are 10,000 people who develop Fox full time and make their living from it.
>Based on what I know about book sales, and my sense that only a small percentage of the people who use any given product actually buy books for it, I think you're way low.

So, how about sharing with us what you know about book sales and about where that percentage is?