The one's out of Leverick do not have to be on guided tours. The Blue Rush guys are the only ones that rent them but they will send people out on their own. Not saying they aren't coming off yachts, but it is possible they are just being rented from Blue Rush. Unless of course you are seeing them being hoisted onto yachts! In which case I would hope someone cracks down on that, but I know that is highly unlikely. Increased Jet Ski "traffic" is asking for a disaster in a small area like N. Sound.