58% of the US adult population never reads another book after high school.

http://parapublishing.com/sites/para/resources/statistics.cfm

An enormous list of statistics about books. Other statistics include: 57% of new books are not read to completion, 70% of US adults have not been in a bookstore in the last five years, and 70% of the books published do not make a profit.

My favorite Snippet:
Libraries The library market was $3-billion in 1993. 68% of Baker & Taylor's sales are to libraries.

HOMINA!

Thanks DIGG!