Jordo got it right, so that new peeps can't reg if they're not referred by one or other members of the board....
I've found a way around this problem with a mandatory custom reg field that says that to register they need to tell us who refers them... But unfortunatly, they can put whatever they want in that field....
I would like a hack that check our members database so that it check if the member that refers them are indeed in our database....