I did a little exercise out of curiosity.
Once a WIS user has accumulated a lot of seasons, how hard is it to improve your overall winning percentage?
I have 358 seasons. To improve my record from .5573 to .558, I would have to win 87 straight games.
How hard would it be to catch someone like, say, mensu?
To reach his .563 record, my teams would have to win 738 straight.
That makes the difference in his success and mine much clearer than merely .557 compared to .563.