From here: http://virtualphotographystudio.com/photographyblog/2010/04/15/moving-from-hobby-to-business-with-your-photography/

The statistics overwhelmingly show that people love their cameras.

• 77% of U.S. households own at least one digital camera.
• Almost 120 million cameras were sold in 2009, with digital SLRs having a 30% growth in sales.
• The average consumer takes 72 digital photographs at each event they attend.
• They share 55% of all photos taken by email.
• And 40% post their images online at sites like Facebook and Snapfish.