In a nutshell ‘maybe’ is the best I could say, but the Internet is a different beast. There are opportunities for many real estate portals in Australia, particularly in regional area or in property type specific areas.

Buying domain would be the most unlikely scenario for realestate.com.au, however they probably would purchase any other site that grew into prominence such as realmap (only an example), they would do this just to protect themselves more than anything else, whic would be understandable.