I think anybody smart enough should be able to deal without having one. I did see one dumba** this past weekend who probably should of had one, although as the comment above noted he might have taken it off as well. I was coming down a black trail, so the people should know what they are doing, and see a guy on the side messing with his board. I just figured he was checking the bindings where he fell and was going to get up, next thing I know his board is sliding down the hill. We both watched and hoped it would jump the side of the trail and run into a ditch, but no such luck. It kept bouncing in the trail and ended up running about a 100 yards down the slope when it hit a skier in the ankles and took him out. It is a good thing they have solid boots, otherwise his ankles would have been done. The board kept going and made it another 100 yards to the bottom of the trail. This is the only case where I have seen issues with someone losing their board. The skier ended up being fine, just got up and dusted himself off and rolled on with his day. I didn't see what happened to the boarder, but hopefully they gave him the boot for the day, this was on the second run of the morning after open.