Good point, Shawn.
When it comes to road course use of R compound tires, word gets around quickly if one tire is significantly better than another. There are a lot more track tires on the market now than a few years ago, with worthy entries (either new introductions, or increased availability) from brands like Hankook, Michelin, Avon, Pirelli, Toyo, and others, in addition to the old standbys from Yokohama, Kumho, and Hoosier.
When one tire is significantly better than the others, people hop on the bandwagon. Some years ago you'd see a lot of folks with Hoosiers, then when the Yoko A032R came out a lot of people switched over to that tire. That hasn't happened with the V710. A few people are using it, but no more so than the other brands/models. The track instructors I know who have tried the V710 have generally told me that it's okay, similar to other track tires, hardly "best" (or "better" than anything else out there). These days the market is pretty competitive, and you'll see all of the above brands in use these days at most road course events.