They don't take into account that, if you played with him privately, he wouldn't have people throwing balls from the rough into the fairway and moving rocks that are in the way of his flight path. Oh yeah, and let them give you a caddy with a yardage book like the one he has. It might not help the higher handicap, but someone in the 5-10 range would probably drop 4 shots if they knew exact yardages.