Yes, if I had the money to spare, I'd love to build a little "heliotropic solar farm" just for the amusement value, too.
I assume the reason that tracking has such a small advantage is that the panel doesn't absorb much more energy if the sunlight is striking it dead-on perpendicular than it does when the light is coming in at, say, a 45-degree angle. So tracking only buys you a lot at the very beginning and end of the day, when some of the energy would be reflected off the surface because the angle of incidence is so acute.
Ran