Check out these ads about Scientology. Scarey because they are actually well done. Imagine if the WTS created high-quality ads on a national media campaign, I bet they would get more converts than wasteful door-to-door work.
http://www.youtube.com/watch?v=h1RaKWS6jb4
http://www.youtube.com/watch?v=Pvku53FL3T8
(top video) http://www.thrfeed.com/2009/06/scientologists-launch-new-tv-ads.html