Free: Contests & Raffles.
If they climb in your boat, they can capsize it. Those things can weigh a lot. 800 pounds comes to mind. When they would get too bad it would stink everything up...so the dock needed to be washed off. Fire hose or pressure washer worked good.
The one picture is our boat the Allison marie. Funny thing was a guy was sleeping in a sleeping bag about 15 feet from those he must have been on something.
Now that is a target rich environment.