Not a huge surprise here, a prediction by Mark Coker, founder of Smashwords...
Mark Coker Predicts: 'More money will be made in author services than in book sales.'
http://www.mediabistro.com/galleycat/mark-coker-predicts-more-money-will-be-made-in-author-services-than-in-book-sales_b62907
Good news for people who do editing, cover art, formatting, and other book related stuff...