I think it has to do with which spot the athlete is from. The snow boarding crowd seems to mimic the surfing crowd in regard to their lifestyle (just an observation). I don't think the gymnasts or shotputters talk that way, though.
Some of the newer sports, like the half pipe (sp?) are very young and tend to have a "cool" image and have those cultural overtones. Older, more traditional sports like the speedskaters are a bit more conservative.