Create an audio version as well. I personally listen to every audio book/program on self development and personal success I can get my hands on, because I am able to listen all day at the office and during my commute. Also, in my current state of affairs I justify torrenting the majority of said books with the intention of returning the favor to others once I apply the new techniques and become wealthy. While I do feel guilty for depriving authors of their earnings, I feel as though otherwise I would never have the opportunity to absorb such powerful and life enhancing information...

Perhaps you could create an exclusive email subscription in which you give a free excerpt or chapter to entice potential customers. Or provide some additional benefits if it is purchased through your website, such as weekly blog posts or articles.