We don't have the population, and therefore the budget to rival the US. Sure a park may be able to blow 3 years worth of CAPEX on a single, worthy attraction, which:
[*]We'll all love, and rave about
[*]the park will advertise the hell out of it, trumpeting the latest 'record breaker'
[*]another international park will beat it in less than a year
[*]The park will again be forgotten on the international stage.
[*]the park that does it won't install anything else for 3-4 years while they recover and recoup the expenditure, leading us all to criticise the park for not building anything new.
[*]The park attempts to scrape together what little cashflow it (or it's shareholders) are willing to part with just so that they can install something 'new'
[*]the new attraction isn't anywhere near as 'wow' as the record breaker - people criticise, and want better rides.
[*]the park is condemned to poor attendances, lack of cashflow, leading to poor upkeep and maintenance, and requiring the park to cut costs wherever possible.
[*]the park is further criticised for failing to maintain standards, theming, keeping rides open for the full operating day, etc.
[*]the park goes further downhill due to that criticism
*Disclaimer - the parks mentioned in the above description have remained nameless to protect their identity and no similarity is intended to be drawn to any park - whether in coomera or not