since the DemoBase Nations Cup #3 strated, Luminaire made up a system to place your bets on the winning team and players with good scores etc to win money. You dont have to pay anything, you can only win.
The rules are clearly explained in the section 'Forum Stats'. Of course, you need to be registered on the forum to be able to participate. Try to place your bets on time.
Goodluck to all participants.