A medium with a loyal legion of fans will persist so long as it can hold its demographic. While fandom is an amorphous beast, within it lies the subset: the fan club. While one can talk about being a 'comics fan' in general (or a hentai fan or fan of cartoon robots), fan clubs have a more specific agenda and narrower focus. To whit, you can have a fan club for a series or a character; for a writer or an artist. Members of a fan club get together to discuss the latest developments, and projects, in their favourite series, characters, or creative talents' lives. If you're brave enough to declare your love for Fatty Arbuckle then it's easier to do so in a room full of likeminded people. Though comics may not push the envelope (or soda bottle) in quite the same way, a passion for a less popular figure risks derision in the wider fan community. And that's where fan clubs come into their own.
Still, and I realise the irony implicit in stating this within a blog devoted to comic books, there is something in the fan club that suggests meetings in a treehouse. But if one can have a Desperate Housewives Fan Club..