Putting corruption aside (if that is ever possible), if the unthinkable happened and governments took measures to start clawing back their deficits by closing these tax loopholes for large companies as Jock P mentions, unfortunately everyone here knows that these companies will simply pass on the tax costs to the consumer (and the board members would give themselves squillions in bonuses for keeping profits up).
Prices would rise, and in Sydney's case, we'd have to pay the increased costs, after all, what other option to Sydney Airport do we have in Sydney???