Can you expand on what happened in Mackay in 2006?
After about 5 years of rapid price growth, Mackay's housing market went flat and didn't move much for a few years after everyone jumped on the bandwagon. It looks more interesting now since there is a lot of investment now planned for the ports in that region and other infrastructure such as the Mackay Base Hospital expansion (and that everyone else seems to have been distracted by what's already happening in Gladstone and Moranbah).
On Tannum Sands, the population of the twin township of Boyne-Tannum is currently somewhere around 12000. On some projections, the population is expected to increase to about 26000 by 2030, with a significant amount of that growth in Devine's new Riverstone Rise estate next door at Wurdong Heights, which recently commenced construction. Tannum Sands is quite a nice place, IMO - it's the only suburb in the Greater Gladstone Area that has a beach and a river!