Slick - Primus, Optus and most others are just reselling Telstra's wholesale service - ii Net are the only ones I know of that are installing their own hardwear (DSLAMs) in exchanges and just renting the ULL (the copper cable with no dial tone).
Telstra wants you to pay for its network (so it doesnt have to) pair gain can cope with the speed (well it does at my place).
How do I get a 100Gb/s link?