Even achieving a 30/70 split in a male-dominated industry will help defuse some of the rampant masculinity which passes as social interaction (aka primate chest-beating). Having people around who think differently and don't want to conform to the established practices of pissing contests, dick-measuring and chest thumping will help establish better modes of operation and contribute to better decisions being made (no more buying product X because the saleswoman had huge breasts or the salesman displayed dominant primate behaviour).