I am skeptical that very many people have seen greens running over 14'. I know I never have. The course at which I caddy got the greens up over 13' for an annual event, but said they were very near to killing the greens to accomplish it.
Also, I am very skeptical that there are more than a few courses that would be playable at that speed. I would think it is very near the speed where the ball would never stop. The greens must have some slope to allow drainage, even in the flattest spots.
As mentioned, Lulu would be unplayable. A couple years ago, I played Lulu and Union League at Torresdale. I think Torresdale would have to keep the greens no faster than 11' to be playable.
In my opinion, I truly can never understand the obsession with extremely fast greens. I believe I putt better when they are "quick," which to me means something in the 10-11' range. Anything too much faster and you lose a lot of interesting hole locations, I think.
There aren't very many. 13+ is quite rare.
In Southern California, our (mostly)
poa annua greens can be kept ridiculously fast with cutting, light sanding, and rolling in the cool months.
As an example, when I played the California Amateur at MPCC in 2006, I stimped the practice green -- just after it had been watered -- at 13.5. I have stimped Sandpiper in November at 13+ for the Sandpiper Invitational. Saticoy, I have never played, but I would be shocked if they weren't 13+ at certain times of the year for tournaments from all I've heard.
There are a few others, but not that many.