This is an interesting idea, it would be interesting to see how it would be balanced.
This would ruin games - people would aim to just kill other players, even if it means suicide for themselves... instead of using strategy to win!
Please don't encourage the killing of higher ranked players. It will suck for them and they will stop playing. Eventually you will also get to the higher rank and get victimized and you will realize there's no point to play because you will be picked on when you get ranked up.