Here's an article on how much Americans spent on hunting last year.
Americans have spent over $100 BILLION.

Here's more details, and the rest of the story:

http://www.huntingclub.com/Hunting/Newsletter_Folder/Newsletters/Week_of_6-21-07/Americans_Spend_Big_On_Outdoor_Recreation_Last_Yea r.asp?cstid=006059429596