There are more ways to assimilate information than reading dead tree editions. Why not get your book out to people who prefer to listen to books in the cars or on their i-pods? Why not offer it to people who like to download books onto their computers or Kindles?
You've spent all that time researching and writing your book. Ultimately, your vision wasn't just to publish a traditional book. Your vision was to offer the world vital information or a compelling story. Think outside of your book!
Here's some information on one company that offers spoken books: audible.com .
Here's some information on Kindle, which currently offers about 1/4 million books.
As I keep learning options, I'll keep you informed.