The negative effects would make it to where you dont do this in normal/custom games. Only in ranked elo based games, where everyone would be within a small margin of eachother elo wise in comparison to custom games, where elo would not matter in team making and you would only play normal/custom for fun. The counter would be full for rank but in custom/normal you would only count kills, deaths, assists, first bloods, number of each type of kill streak. Ranked would want everything for a more correct elo whcih would actually count things like wards, assists, and denies more highly rather than kills to prevent heavy ksing and what not.