A developer has a few options when it comes to telecommunications. The first is that Telstra install copper (connected to a RIM) for essentially no cost due to the access requirements. Therefore ADSL at all is only a "maybe" but is delivered a very low cost to the developer. The second is the above plus they pay for a company to install a FTTH network (such as Optus, Telstra, Opticomm etc) and therefore offer 100Mbps+ services rather than congested ADSL. Guess which one your developer chose?