The thing is that most crew have not been with Seabourn for that long,yes there are the odd few but generally crew do not know regular sailors.
Money spent over the years by many guests would not feature and I don’t think the crew think like that anyway.
So good manners and a smile with a good attitude might get you that extra booking that you want and for me, a 20.30 table makes it easier for the host to find a table as many diners have left after their 18.30 booking.
That's a free tip from me 😉