ACMS you seem intent on trying to prove a very precise point using rubbery figures and hearsay.
You proclaim, "QF people have reduced the pax to 450 JUST SO AS TO MAKE THE FLIGHT", reduced it from what?
It didn't happen, the reason there are only 450 seats on the A380 is because it is a 4 class aircraft. When Qantas put 32 Premium Economy seats on the 744 they had to pull out 60 Economy seats. So without P/E class there could be 480 seats on the A380.
Or if your story is correct then why are they getting the same configuration on ALL their A380's. Surely if 450 pax is required solely because of LAX-MEL then the A/C heading to Europe would be in a different configuration, just like the Pacific and non-Pacific configured B744's they have now.
Your clams and stats are full of holes.