Don't forget the clubs.

I think the local clubs do the majority to promote the hobby. I don't ever recall a new person coming to the field saying "I saw this story or heard about the AMA". Usually its "I see you guys flying here all the time. How does someone get started ? " And usually their next question is "How much does it cost to get started?" And honestly it is really tough for me to tell them it is going to cost $300 - $400 for a trainer plane, radio & related field gear PLUS $40 club membership and $58 AMA.