JohnK said:
Not much difference from Gold to Platinum.
No.
Travelling PER to East Coast twice a month (& back I assume) would be 24 return trips per annum. At around 3600 miles per round trip (more to SYD/BNE, less to MEL), that would earn 5400 FF points as a Gold or 7200 FF points as a Platinum on a round trip. Therefore net benefit of being platinum is around 43,000 pts, which is surely at least a bit of a difference.
The other big difference I found was when it comes to redeeming FF points for QF flights (officially same availability for both tiers, but in practice have found some variations).
And of course, the ultimate benefit only applies if you happen to be flying through Hong Kong on One World, access to the First Class side of the best airline lounges in the world!!