DVD's definitely aren't my prefered medium either but they are definitely the easiest for viewability.
Movie companies make 500% more profit on dvds vs itunes downloads. Just sayin, I like HD just as much as the other guy but really it'd be sick if they could include an HD copy with a dvd for $5 extra or something. Oh well, i should just buy a bluray player.
Anyways, selling a movie on a 1gb sick (btw HD ski movies are 3-5gb) would be very insecure and would be so easy to burn/upload to a torrent, etc. No ski movie company will do that.