In a wins per day/week/all time leaderboard, players can take a break after placing high for the day or week. In your wins per season leaderboard, nobody can take a break and it is a no-life competition, I can see why you'd want that as you are basically always online. You also have a 9-1 ratio which would attract more and more negative ratios for you to streak off of as they'd see you are worth 9 points and repeatedly try to beat you. Your leaderboard is probably the most biased idea I have ever seen on this forum.
And I am speaking for the players on the top of the leaderboard, the only ones succeeding in sparring really lame. There is Abood who runs away from everything that is positive, same with Jack Sparrow, same with Edin though he isn't there anymore, same with Vlad who you mentioned. Then there are "hoarders" who get high rating and disappear then cover it up with the excuse of having something better to do with their lives. Ex: David.