What SNaugler said.
Also, it's one of the biggest greens on the course -- in fact it might well be the biggest, I've never seen the numbers for them all. That brings three-putts into play, just because you haven't seen many 40-foot putts up to that point in the round. And it's in one of the most exposed spots on the golf course, so it has to be flatter because of the wind. [They had to call off the AT&T one year when balls were blowing off the 17th green, which has a bit more slope.]