It's the fact that I not only play games (and have been doing so for about 20 years), but view it as my primary hobby and invest considerable time in the medium and most things surrounding it; heck, recently I even wrote my BA thesis (in part) on the subject. In essence, I'm fascinated by the medium and immerse myself in it, stay up-to-date on current events related to it and try to expand my horizons (including those outside of gaming) through it.