People here mix up things. It's one thing to be one of the best skiers/boarders - no role model duty here. But if you willingly expose yourself to TV coverage and take parts in competitions that are being broadcasted in a major way, which means making MONEY off the industry which means indirectly profiting from families and kids watching and buying your sponsor's stuff, you should be a role model. Sure parents should teach their kids not to copy what pros do, but since you chose to play along with the industry and as I said profit from kids' enthusiasm and money spending, I'd say you're morally obliged.
tbs, this guy rocks! Very nice and very off axis.