You can flights from $67 sometimes, I paid $129 return KL Perth once so $350 nothing special ,Jestar Tiger Scoot AA have promotions for low season all the time of course this is the bare bones to Perth , a lot more to Sydney Hobart etc no bags meals etc once you factor all these in $500 I usually pay to Brisbane on Emirates etc seems better value.

Unless you are a travel agent why would you wish to compete with

Skyscanner
Zuji
Kayak
Momondo
Chepafligts
Orbitz etc