Well, not really. I find that people seem to always think that others are making huge money from whatever they are doing.
On a personal front, you would be amazed at the number of peole that think I am rich from writing a computer programming book. It is only after you sit down with them and disect the economics of writing a book that it becomes obvious that writing a book is not a huge money maker for the authors of most technology books. In fact, I would classify writing a technology book as falling under the area of money-loser.
Another example. Do you think that online music is a big money maker for the online music stores? Think again. This article seems to question the viability of online music stores because of the fairly small margins. http://enjoyment.independent.co.uk/music/news/story.jsp?story=564004 Is the article real or merely propoganda to be used against the music labels? That's for someone else to decide.