Nautilus thanks for the input without any playing the man. I find it difficult to disagree with most of what you say, however
The actual purpose of PH airport is to make money, nothing else. Same as you airline only exists to make money.
PAPL exists soley to make money. Perth airport exists to provide the population of WA with an effective international airport, this is writ large in the head lease signed by WAC now PAPL.
Using the "airlines are here to make money too" analogy breaks down pretty quickly as there are MANY operators but ONLY ONE airport. A natural monopoly. If airline X increased costs to pax by 20% then made it difficult to book and check in with them they would lose market share to airline Y. If PAPL make/have made Perth airport painful, slow and inefficient as well as expensive to use (EG parking) who do they lose market share to? No one. As no one else can provide what they can provide.
The buildings east of HM drive are clear of the land for the parallel runway, but there are some businesses that will have to move. Google Earth is helpful.