When companies sponsor athletes, they want to market a majority of their product, not just some.  So, while some of the other riders might be marketing the foils and guns, he markets the park oriented ski because he hits the park a lot.  If you watch War, you will also notice he wears some of the lower end Oakley clothes (paratrooper and puffy pants, etc) while some other guys are marketing the matching suits and high end stuff for out of park (seth, pep, boronowski).  That is just his job.  I am pretty sure he doesn't mind making thousands of dollars, missing school and getting free gear when he is only 16 or whatever