Online he may be number one, but is he number one in real life? Online fame comes with a price and I would not doubt it if he paid it. I used to play Runescape and WoW, those kinds of game take up way too much time per day to play (you can miss a lot in life playing those games if your not carefull).
Personally, internet fandom is over rated in my opinion.
Zezima gave an interview with some RS site or the other at some point and seemed like a fairly normal guy who just happened to like runescape and be a bit obsessive about finishing what he started.