I can understand the boat point but I really don't think this guy owns one. The saw blades weren't around the edge pylons, they were up under the dock about 2 ft. As for the hooks, I can understand that too but the blades cause people to leave more hooks.
I would have moved on if he simply put up a sign. Instead I'm ticked because I have $5 or so of tungsten weights, hooks and baits under his dock.