Author Hugh Howey (<a href="http://www.hughhowey.com/" rel="nofollow">http://www.hughhowey.com/</a>) wrote one of the most successful self-published Kindle series to date (Wool, and its sequels Shift and Dust).<p>He (along with an unnamed co-author) wrote a report that analyzed data from public sources about authors' revenue segmented on publishing model and popularity, among other dimensions. The results are fascinating.