-not that my opinion matters here-
but changing it to just a win count daily/weekly/all-time would make you waste more life getting to the top of the board. As I understand it, under the current board, sparring people with a lot of points will get you to the top quicker than sparring noobs.
Changing it to a win count board would be no different than the PK boards-- a disgusting scoreboard that has no way of reflecting skill.