The counter seems to work different from the pennants. You get +1 to viewed games when you quit the game, not join it. Also, you can quit and join the same game over and over again and the games viewed counter will still increase by 1 every time. So, basically, you can get 100 games viewed by rejoining one game 100 times. Not sure if such mechanic was intentional.
The image with the bug: wyrm bug.jpg