Add a regular crossfire game but 1 player pays to make a clan. Then that style of crossfire is open to him. Then he can invite his friends to ranked clan battles. where the game keeps track of your win ect. be cool for a game to do all that and have a cool leaderboard.
But what if only acouple clans do that and im sure clans will get frustrated when they keep versing the same team over and over again. It could also make clans mad if they keep losing to that team. It be a good idea if the game was bigger but not many people are playing yet, its to soon i think. If anything make it free not paid.