It's widely acknowledged that Telstra's LTE network is by far the best in Australia.
It's also by far the most expensive.
The 180GB of data used for the tests would have cost them - assuming "BYO device" plans and that Telstra did not give it to them for free:
On the "Large" (50/30GB) home wireless plan:
$150/month + $1300 for the 130GB extra used during peak times.
On the "M" (25/15GB) home plan:
$100/month + $1550 for the 155GB extra.
On a "M" mobile phone plan (10GB):
$45/month + $74,800 for the 170GB.
It's also by far the most expensive.
The 180GB of data used for the tests would have cost them - assuming "BYO device" plans and that Telstra did not give it to them for free: