Devil's advocate here: why do captains find it so important to meet jumpseaters before the flight? It looks like it gives you the illusion that you have the power to turn people away, but yet, if you were to do so regularly (for no good reason), the jumpseat privileges of your company would probably be more at risk than the jumpseat priviliges of the non-greeting jumpseater, would it not?
Just a thought...
I personally have no issue with taking jumpseaters who don't come to the cockpit or introduce themselves. As long as the gate agents know and our load is ok, it's fine by me. Maybe I am not as power hungry as some
You could even argue that informing the gate agents satisfies the requirement to inform the pic. Just like the PIC is responsible for all aspects of the flight but delegates loading, fuelling, filing flight plans etc, one could argue that the "meeting the jumpseaters" is delegated to the gate agents.
If the gate agent gives me a boarding pass and they tell me there is no need to talk to the captain, why would I do so?