Author of The Four-Hour Workweek Timothy Ferris offers his own detailed analysis of how most authors currently make money from their books, and includes some sensible advice for those considering their options. In his case, though his book has ranked high in the Kindle store and is one of the ten most highlighted Kindle books, on his end of 2009 royalty statement, ebooks comprised a grand total of 1.6 percent of units sold. He does know people who publish digital-only quite successfully–but “the downside is that you need to be a world-class marketer and understand affiliate and CPA advertising better […]