What he says. You get extremists/purists in any walk of life. It doesn't make them any more or, me any less of a fan.
Don't get me wrong with my post above - I'm not trying to say "unless you're this big a fan, you can't call yourself a Trekkie". I don't care, really. But people like labels that help them identify levels of interest. There's a difference between a casual coin collector and someone who would be referred to as a numismatist. The casual collector certainly has the right
to call themselves that, but the word kind of implies something more in most people's minds (if, in that particular case, they know what it means at all.