Not long ago I did a story about how e-book piracy was accelerating and that publishers should be concerned. But while piracy is certainly an issue, there's something else lurking out there that may be a bigger problem: e-book price erosion. Or put another way, the blogification of the book industry. Just how many 99-cent e-books are in the Kindle Store's Top 100 on Amazon? Slightly more than 20 percent.