If QF cannot make a profit with the A380, why should J* be any different?
No-one will look at an A380, see a big orange star on it and think they should charge any less for services for it than one with a white rat.
There is no such thing as:
*Low cost fuel,
*Low cost Airways and Nav charges,
*Low cost maintenance,
*Low cost landing charges,
*Low cost handling charges
*Low cost spares...
If they sent it to LHR it would have to be fully catered for the length of the flight, even if the punters have to buy the food.
The only difference would be the pittance they would pay the pilots and the FA's. Whilst it still is a pittance, we are talking a fraction of a fraction of the total operating cost of the aeroplane.
Filling it with 700-800 backpackers crammed in for a 22 hour fun-fest to LHR would last about 2 weeks till word of mouth got around. Can you imagine it?