Jake Bible has ceased production on his popular Podcast audio series "Metal and Ash". Five chapters into the third novel Jake did the math and realized people were not buying his print/E books because of the serialized audio books. If you want to hear some real life numbers on podcasts, audiobooks and marketing success I suggest you listen to his last post and his interview on Dead Robots.
You can read more here: http://www.zombiemib.com/2013/03/jak...st-ceases.html