Population wise, I think you're underestimating the percentages. There are far more Average players (90%?). Hours-spent-in-game though you might be closer. Better players spend more hours, and so are more visible.

As a game developer I'm an uber-dabbler. Once I can see how the game works I'm straight on to the next one. I'm chasing the meta-target of understanding games as a whole so I can't get fixated on one.