So far I wouldn't say the winner was the one with the most time on his hands. Dude works 40 hours a week, and can't play at all during work hours. He certainly has more gaming time than someone like me, but there are others here that I'm sure have more gaming time than him.
But you're right, ultimately whoever is willing to spend the most time playing the selected game each month will win, or come close to winning. I know we're trying to pick games that require skill, but the more time you have, the more time you can spend playing the game and getting better at it.
It's also not serious enough for me to have even spent this many words discussing it. I think the point is to have fun with a friendly competition. In the end the winner deserves props but who really cares if you win or lose if you had fun participating?