This is a brave move by Adventure World. The west coast, aside from Perth, is sparsely populated. Perth is pushing 2 million people. The other major population centres are on the east coast - several hours by plane.
Australia's major theme park coridoor is on the East Coast by Brisbane. Brisbane has over 2 million, and Sydney and Melbourne 1-2 hours by air away. There you'll find Disney inspired Dreamworld, Sea World, Warner Bros Movie world, and Wet n Wild.
Theme park attractions away from there dont have a great record, the two luna parks aside- Australias Wonderland/Wonderland Sydney closed a few years back citing low numbers (critics however point to a lack of investment), Sega World in Sydney closed well before that, Fox Studios abandoned most of its theme park style attractions for a cafe/bar precinct, and attempts to build anything in Melbourne keep getting shot down.
Brave and courageous, but not sure its the smart move.
However, allow me to step into the role of tourism ambassador for a moment: I do think the Gold Coast and it's 3 parks would be a superb way to kick off a trip for US travellers doing a theme park tour of Asia. Just think about it, it's a clean, safe tropical paradise which is set up for tourists that speaks the same language you do, which makes it a nice easy step to get your head in 'holiday mode'.
It's 3 parks each offer something unique for visitors; Dreamworld has Aussie wildlife displays which international visitors would love, as well as a pretty decent thrill ride collection. Also they tacked a drop ride onto another ride 15 years before it was cool.
Sea World Australia isn't connected to the parks in the US, and as such for foreign visitors it's like entering an alternate reality. All the staples are there; Seal Show, Dolphin Show, animal exhibits and a small collection of rides, including 3 coasters for thrill seekers. The only thing missing is Orcas, but they do offer a pretty unique alternative as an up charge: If you visit between June and November each year, Sea World run Whale Watching cruises. And I'm not talking Orcas, I'm talking about Humpback Whales.
Warner Brother's Movie World is another studio's take on the Movie theme park, and boasts a few unique attractions to make it note worthy: The indoor Scooby Doo Spooky Coaster (arguably the Workd's best mouse coaster) and Wild West Falls flume are both 'best in class' type attractions, and I should point out that the later is probably the closest you'll ever get to rising the Western River Expidition. For the thrill fans the park also boasts an Intamin Accelerator coaster (Superman Escape), S&S El Loco, and a SLC, featuring new Kumbak trains that provide a head bang free ride.
The Gold Coast is also a family friendly tropical paradise (no really, it is!). In many ways like Miami, but much, much nicer, and with more for tourists to do. There are 2 big water parks, as well as all the usual tourist traps (Theatre restaurants, nightclubs, mini golf, shopping galore, casino, arcades, bowling alleys). Like I said at the top of the page, I'd say that adding it to a holiday that takes in Hong Kong, and Japan would be a worthwhile investment for theme park fans. I mean you're over this part of the world anyway, may as well chuck another country on the itinerary while you're at it :)
However, Chad - it isn't true to say that Adventure World won't reap benefits from putting in the coaster - it does have a high local presence - and that's about it - no one actually comes to Perth to go to Adventure World and i'm pretty sure Adventure World know that!
Either way - at least I can say I have a home park, which, other than if I lived on the Gold Coast, would be almost impossible in Australia!
Also James - I love your description of the Gold Coast parks - they are really Australia's best theme parks and my first real introduction to how awesome a theme park can be - Movie World is my favourite - Dream World for me is less of a theme park and more of an amusement park - and SeaWorld a wifelife/marine life park. Movie World, while small, has an atmosphere to it. I'd really encourage any US visitors coming to Australia to make the Gold Coast a destination to visit - apart from theme parks you have Steve Irwin's Australia Zoo, the bottom of the Great Barrier Reef and Islands relating to that just a bit north and lots of shopping and lovely beaches - plus the whole place feels a little like a smaller version of Orlando, a resort/holiday town...the Gold Coast is also only a short flight from Sydney :)
It's Gerstlauer and they also made SAW, hence it's pretty much the same ride modified for a new theme and location.