i think the fact that freestylers dont go to racing is a result of the culture difference; most freestylers view racing as gay and i think a lot of racers, after accomplishing goals, want to start "looking cool" and dressing warm i guess, i dunno.
Dont get me wrong, racing is definitely hard and techinical but i think freestyle overall is a lot harder to pick up and become a really good pro at. I think this is just because of all the various disciplines you have to be good at in freestyle to be good in freestyle so to speak. For example, you got rails, jumps/pipe, cliffs, and pow. Every major pro is good in all 4 of those categories. Jon calls himself bad at rails but he can lip 270 pretzel 270 out both ways onto a kinked rail. Hes decent at urban too. In racing, its more or less right vs left turns.
Theres just so much to learn in freestyle from like 50 different jump tricks with some insanely hard ones like dj flips and kangaroo flips and 720 twin nose to like 50 different rail tricks with pretzels and all. Racing you just practice more or less the same stuff over and over again. Granted every course is different, but every rail is different too and so is every jump.
Plus the consequences in high level freestyle of failure are greater than racing. A 60mph crash in a race sounds scary but they wear some sort of padding in their gs suits and the new spyder ones have d3o in them. Plus theyre more or less skidding down the hill, not really taking a full force stopped g-force inducing impact. Its not like theyre crashing 60-70mph into a wall, they kind of slow the intesity of a crash. On the other hand, tanner hall and simon dumonts falls kind of represent just how dangerous freestyle really is.