Secondly, I see US is missing from the list as well! US has an entire city for gambling and it is a prime destination of gamblers and tourists from around the world. I am sure everyone wants to visit Las Vegas at least once in their life! So I seriously feel the list is flawed!
That is explain why i guess .
It is always about culture, australian loves gmble so much due its culture in the past but some people also denied it and says it was not about the history but it was because of the marketing and the industry grow so fast followimg with government support as it gives them a great income through taxation which unfortunately causing this big stats in australia .
They are taking gambling as an entertainment too serious.
Not looking at the stats, I would say that US is still the top spot and then Australia in the APAC region. This two are heavily on gambling, with so many sporting events being held on those countries reguarly, you name it, from tennis to golf tournaments.
I'm not really sure about EU though, but I suspect that Germany or Spain in the top in that region. Macau is just small in population, so even if they have high luxuries casinos, only a few can be called high rollers.
But when it comes to gambling in average statistically australian are the one who spend the most compared to any other country , yes statistically mathematically.
But when it comes to impression , i will choose united states as well as UK besides the number of gambling company (a large and multi-national one) come from there.