I think if they companies hadn't increased the price when DVDs came out by so much you wouldn't see so many people downloading the videos. There is no reason that a DVD should cost 2-3 times more than a VHS tape but when they first came out the skate industry made the bad choice to take advantage of the newness of the DVDs to increase their price with no real increases on the production side.
OK, maybe their is a slight increase due to paying to get the menus done and all that but cost of DVDs is really low and economies of scale seems like it would make that additional production cost neglible at best and definitely not 2-3 times the cost to produce a VHS tape.
Basically, I would buy way more DVDs if they were 15 bucks like the VHS tapes used to be but 30 bucks means I got to really, really like the video to buy it.