Part of it is the fact that legends cars started on pavement and that has been a focus of 600. That is where they have focused on promoting the sport. Also, I am thinking that a lot of dirt tracks have legends racers without licenses. That number seems really low, so there are probably racers who do not want to pay the money to register. I would imagine that the license deal is more closely monitored out East than it is at dirt tracks in middle America (and Canada). I do believe that there are more asphalt racers and a big part of that is probably due to what tracks are close as other people are also saying. Here is the midwest, we do not have much in the way of asphalt tracks, and even fewer that run legends. I am dying to try pavement one of these days when I have the time. Having one tire for both surfaces would sure help with crossing over, but as we have seen over the years, one tire without cutting is not realistic.