I agree with this. I spar actively, you might have seen me around.
With the current leaderboards, anyone can get a high ranking on them, fairly easily. Right now my rating is about 7,200, but I could probably get close to 8,000 if I selective sparred. I like this idea, however I think that a sort of 'KDR' setup would be cool.
This is my take on it:
The spar leaderboard is divided into a day, week, and total section.
Every player has a ratio, however it is a exact decimal.
Basically the formula is Total spars, divided by spars won, = ratio.
Your idea is pretty cool too though. At this point, I would be happy with any type of change for the better.
As for the spar hats, I think they should be re-added. There should be a hat for 5,000 wins, 10,000 wins, and 20,000 wins. Also, ratio hats would be cool. For example, you must be 2-1 in order to get a certain hat. If you don't maintain the same or a higher ratio, the hat will be unwearable.
Also, there should only be one spar leaderboard PER IP.
I'm tired of seeing alt accounts with Top 25 spots.