My usual retort to those who classify fandom with trainspotting (ie most of my acquaintance) is that nearly everyone watches television (some fans less than average), non-fans are content to sit and watch, while fans try to participate in social and/or creative ways.
Tavia
Well, put, Tavia! I only watch 3 shows on TV these days, only 2 of which are genre. But I have boxes of videotapes of anime, British comedy, musicals, fav movies and SF. Of which I rewatch maybe 2-3 hours of a week. My currently active fandoms are Blake's 7, which I have stuck in fandom of because I am fascinated by the viewpoints on the list, and Harry Potter, where I have been developing Snape in fanfic and participated in an online version of Hogwarts where I get to relive my glory days of being one of the best students in the school. :)