Transporting SLF from A to B
MOL has a point, assuming it is indeed valid.
Some of us spend part of our time as SLF and would prefer to park our car at the door of our aircraft. We accept this is not always possible and are ready to accept an additional cost to allow SLF to pay for what they expect.
MOL has many very-low cost airports. He understands the model and it ain't complicated.