Well Herbert and Husq it is pretty obvious really, well to me anyway.
NO-ONE has any etiquette.
It seems to me that even people who agree with sharing and caring throw it all out the window when it comes to catching waves or getting what they want.
Not whinging it is just an observation from a lifetime in the water.
I surf Noosa regularly and pick my times and tides. Often a local will see you in the carpark, have a chat and then proceed to totally ignore you in the water while he snakes wave after wave.
My point is that with most ( not all) people etiquette goes out the window when they are in the water.
Just saying.
ET.