The scary issue reminds me of one frequently encountered when mooring at the Bitter End or Saba Rock. Sail boarders zipping through a crowded mooring field who see themselves having right of way over sailing vessels under power headed for a mooring ball between two other vessels. Unfortunately, a 50 foot sailboat under power is not able to stop on a dime or turn away to avoid a collision. I don't know if a collision has happened yet, but I've seen some very close calls.