These guys are making money selling the likes of rpdata service to the users, as like what  Crutchfield does, they pay in the region of  $9 per extra  user and then on sell this access for $150 per month. also this os a possible breach in supplying this data in Victoria as you have to have a real estate licence or finance licence.

I heard from a source that works there  that they can have at any one time upto 1000 active clients, 1000 x $179 per month = $179,000 per month access fees, They are selling data services, and with this data, providing details of every home owner, the price they paid and their contact details to whoever will take it / pay for it.