So? What's wrong with on-paper mileage runs? Considering I'm going to do it anyway, I *should* be able to tell the airline that I'm doing it for a mileage run and cancel without refund to get the FF points and let the airline re-sell the seat. That way, the mileage runners get something back (airport taxes and the comfort of staying at home) and the airlilne gets something back (the ability to sell the seat for more revenue).

... and by sell the seat again, I meant sell it at a higher price. That way the airline can compensate and make up in revenue what they lost from the mileage runner's future desires.