Scrabble - "Dimorphism"

From Losing Friends, Charismatic People, Wikipedia by Rob Henderson.  

In Scrabble, women account for 85% of all recreational players, suggesting that women should be dominating the elite Scrabble ranks. But interestingly, men in fact dominate Scrabble’s upper tiers. No woman has ever won a national or World Scrabble Championship. (source).