Science fiction fandom is notably laissez faire on social issues, and many a sci-fi discussion on Card has degenerated into whether or not you can support, by your purchase of his books, a writer whose beliefs many anathematize.
The X Files is one of the few rare shows that for whatever reason, resonated with enough people to create a large and healthy 'cult' following in sci-fi fandom, spawning numerous novels, two films and multiple websites.
Whether you are a fan of Buffy (Sarah Michelle Gellar), Willow (Alyson Hannigan), or Angel (David Boreanaz), you should be able to find a Buffy the Vampire Slayer wallpaper to satisfy your fandom.
They also allow a show to live on past its cancellation date and such as is the case for Star Trek keep that fandom alive to propel further development (movies, new series, etc) in the future.
A satiric and yet affectionate look at science fiction television fandom served on a bed of interstellar action adventure is the recipe for the 1999 movie Galaxy Quest.