No one really makes any money out of doing this. Charges in Clan games go towards prizes for the winners. Charges in non clan games are minor and ussually just to make up for someones place being used, soda drank, toilet paper used, electricity, dogs shaved (Hey weird shit happens sometimes)
Mainly it's about a bunch of guys getting together and playing and the money is merely a small thank you to those supplying equipment and places to play.