Deffinatly, because it all evolves around a lifestyle, certain styles, and individualism.
where as sports are about teamwork and stuff.
you don't see someone hit a really steezy looking homerun in a game of baseball... they all pretty much look exactly the same. where as in skiing, skateboarding, and biking every individual has his own unique style and can pull off any specific trick with a certain amount of their own style or in different unique ways.
certain people have very different unique, yet amazing looking kickflip (or any trick for that matter) in skateboarding.. catch a drift in what im trying to say?
like you dont just see a guy running around all by himself in the feild throwing his football for the heck of it (or at least very very rarely) where as you could see some dude cruisin down the street skating and doing tricks for the personal satisfaction and general sense of accomplishment while landing and learning new things.
I don't know, it's just different than sports.
That's my conclusion.