I think there should be a "Top Killer Of The Day". Then the "Top Killer Of The Day" receives a certain amount of money based on how many kills they got that day, this could increase the players on the DanCraft network and would give players a reason to play longer hours and to tell others about this server. This could also increase the amount of players purchasing ranks so they have better equipment to get more kills.
Maybe there could be a voting system where if say twenty players vote for a player to removed from the top kills because they are using an unauthorized client modification then they are removed. If this is false there could be a penalty.