Alan, if you play a negative game, win goals are great if they reduce your play. Anything that reduces play is helpful -- as Arci says, rub the rabbit foot every hand. If you play a positive game, win goals make no sense. None.
To quote Penn from the opening of his show, "Las Vegas!! What a place! The casinos advertise 99% return! And PEOPLE THINK THAT'S A GOOD THING!!"