Clearly you don't because it's equally expensive to buy hardware here, most countries are relatively expensive in comparison with the US or Asia. I checked a fair few examples and if anything things are slightly cheaper in Australia, not quite the case with AMD hardware but still not a 120% discrepancy.
ASUS 980Ti Matrix Platinum
CPL - $1249 AUD (£678)
OCUK - $1269 AUD (£689)
EVGA GTX970 Superclocked ACX2.0
CPL - $515 AUD (£280)
OCUK - $532 AUD (£290)
Gigabyte GTX Titan X
CPL - $1569 AUD (£853)
OCUK - $1767 AUD (£960)
Sapphire Fury X
CPL - $999 AUD (£543)
OCUK - $937 (£509)
JR