The Damned- The thing to remember, is that a game system can have a fan base. Like any band, author, movie maker, stand up comic, comic book, and scores of other things, people celebrate the things that give them enjoyment. It's not being a fanboy, a fangirl, a geek, nostalgic, or anything other than someone who got pleasure from it.
As I'm sure you know, dates have always been a part of our culture. We celebrate birthdays, holidays, the founding of something, the release of a movie, book, game or CD... and really, the release date of a console fits right in with them. We go nuts when a system is first released, and when a decade passes, or two decades, it shouldn't be that surprising that it's commemorated in some fashion by those who were fans of it.
Is someone creepy for still liking and listening to a band, even after they've broke up? Are they odd for continuing to like a comic book when its run has come to an end? We both know the answer to these questions is a blatant "no". It's also not bizarre when major moments in the life span of those things is celebrated or remembered by their fans on the anniversary of its happening. So why is it so strange that people will celebrate the release a game system that gave them years of fun and good times long after its death on the market?