The ongoing survey of Bitcoin users (here) has some intriguing results already: The
 'average Bitcoin user' is male (96%), 32.7 years old, libertarian /
anarcho-capitalist (37%), non-religious (61%), with a full time job
(43%), and is in a relationship (56%). The biggest motivation
for new users are curiosity, profit, and politics; and 39% of users do
not drink, smoke, gamble, or take drugs. Just over half of users have
mined bitcoins and the greatest community fear for Bitcoin is
“regulatory/legal intervention” followed by ”reputation problems”.
Overall more people seem to find Bitcoin intellectually rewarding (70% have learned more about cryptography) than socially rewarding (22% have made friends)....

http://www.zerohedge.com/news/2013-03-10/demographics-bitcoin?page=6