At first it does sound like one of those 'too good to be true' scenarios, but when you look at all the taxes and surcharges, although they're awfully steep, it's still probably a good deal. But paying right around $400 in taxes and surcharges to go to Australia, which as part of the Asia already PIF--Pacific Islands Forum--I'm sure some will argue that as a continent, it's not part of Asia--it still seems steep.
You can catch flights from Manila to Davao--same nation, and they run like buses--for around $70 right up to an hour before they leave and here the taxes and surcharges are at least $20.
Still, if for around $600 , you can go to a major city in China, Japan, Singapore, Thailand and Vietnam --five nations, that seems like a good deal, but the surcharges and taxes make me almost want to forget about paying $730+ to see Delhi, India or Australia, flying out of Manila, which isn't that far off.