Ike, that's a very good observation. There *are* men that I know of who write cozies--EJ Copperman is one, Jim Lavene (who writes with his wife, Joyce) and Cleo Coyle's husband, who is half of their writing team.
But I think you're right that the number has decreased over the years and men seem to gravitate over to thriller and hard boiled more. Maybe it'll increase because more men are reading cozies than they have in years.