You have to realize that you get several shots and take the best one. In real golf, you get 1 shot. The long drivers are swining as hard as they possibly can, where the tour players are going for accuracy. So those extra 60+ yards that the tour players might get in length will be negated because they are off the fairway and trouble. Long drive players are usually only good at that one aspect of the game where touch around the greens (at a tour quality) is usualy absent.