Sounds like you're talking about a ducted system if you're referring to a 10k install. The split systems only cost $800 to a couple of grand (depending on room size).
Some people buy around Dalkeith/Peppy grove/nedlands for the 'prestige' with no financial sense.
A friend purchased an 'investment' in the area for around $2m 5 years ago. Would be lucky to only lose 10% on the purchase. Upgraded to new ppor in mid-$2m. I can't see him getting his money back...
The money flowed through US banks. Good to see the US are putting their superpower status to positive use, rather than bombing countries or spying on the 7 billion citizens of the world.