This suggests that you buy in a sellers market. A contrarian investor would take the opposite approach...
I buy when I see a market rising, but I also sell in a rising market. It's potentially a seller's market but I aim for the early stages of the rise.
Not all properties are equal, sometimes units will be rising in a particular area while houses are not moving. Also, not all areas/suburbs are peaking at the same time, there are markets within markets, which is what is currently happening in Perth, some areas have peaked IMO.
I am not looking at Syd at the moment, but I did purchase in West Syd 2 years ago as market started rising.
Perhaps today its similar to Perth scenario time to look at other pockets in Syd that are starting to move as West Syd close to peaking??