Yes the Telstra roaming charges were ridiculous, They were $15 / Mb now reduced to $3 but still crazy.
Telstra are now a real estate company, they must be buying smaller CBD buildings with their reduced bags of loot. Many years ago I noticed when using the remaining credit on my Euro sim in Australia that it was almost on price parity with standard local calls from the Telstra carrier.
Nice find Rob, thanks for sharing.