My 2 cents worth.
The seat is empty and cannot be removed from the a/c so I will upgrade all crew and have since I got the gold / now red tie.
This little bit of humanity builds loyality at a time when it's being drained like sump oil.
We now have one of the most expensive staff travel programs in the world.
Recently did LHR/SYD/LHR on a competitor saving over $390.
Never had a problem with crew but once was asked by AP manager to upgrade 2 J class commercial pax's teenage kids.
Did so but had to pull them into line within an hour after take off, told the AP manager and her reply was she new them from school swimming.
Funny I thought they were high value customers when you brought them to the door!!!!
PP