Well, for one, good park skiers are a dime a dozen in Summit County (I would say this was good, but in today's world, not great). Really fucking good park skiers are a buck a dozen in Summit County.
Additionally (and not hating), his rail game is good, but the jump game is obviously lacking. The single edit conveyed a really small bag of tricks, grabs, and just general air versatility. Like I said, no hate, it was still good, but these are pretty obvious points.
Also, who knows, maybe he doesn't give a fuck. Not everybody has to attain, or even wants, sponsorship. This is assuming, of course, that his abilities alone would be worthy of whatever you deem a "sponsorship."