Qantas Perth - Auckland Seasonal Direct

Why does Qantas expect any special treatment from Perth Airport, they are only a very minor player amongst the 20 International Airlines flying out of Perth, servicing only London & Singapore daily, and proposed seasonal services that would potentially put at risk daily flights by SAA & Air NZ Like Sydney which requires all international flights to operate from the International Terminal, that is the policy of Perth Airport. Why does Qantas want to continue flying out of their substandard T4 & T3 Terminals in Perth anyway, Supposedly the market leader, the Qantas Terminals are at least 20 years behind the very modern Perth Virgin Australia T1 Domestic Terminal adjoining both the T1 International Terminal & T2 Intrastate Terminal.