Weight of its 467 passengers ex luggage, assuming 80kg average: 37.3 metric tons.
That 442 tons has to move as a whole regardless of how lean your diet is. So when you're paying for your flight ticket, extremely little of it is about moving the meat in your body. After all the overheads (salaries, fees, whatnot), whatever's left of the ticket that's paying for jet fuel has less than 10% of it spent on shifting your meat.
Extra luggage is more work for the airline - handlers, check-in staff, tracking, lost baggage recovery. It also means much longer queues resulting in poorer service for everyone. Extra meat weight is a trivial amount of work for the airline to deal with - it moves itself around and consumes the same resources as the 'little people'.