I was reading this just yesterday:
<a href="http://oreilly.com/social-media/excerpts/9780596802004/why-speakers-earn-30k-an-hour.html" rel="nofollow">http://oreilly.com/social-media/excerpts/9780596802004/why-s...</a><p>It's a chapter from the latest book by Scott Berkun (the author of "Making Things Happen") about public speaking and it mentions some numbers for how much speakers can get paid. At the very bottom, he writes that he's averaging $100k a year right now, from books and presentations. Just a few data points.