True.I have seen stories about those working at the mines on a good wicket, earning $200k driving a truck or shovelling dirt and buying a bunch of negatively geared properties... I wouldn't call that professional or savvy investing without qualifying their situation further. I don't think the number of properties really dictates whether someone is a savvy buyer or not.
If you are on $200k or more, and are sensible enough not to smash all of it on lifestyle and doodads, it would be too easy to rack up half a dozen properties without being really savvy...
You could save a fair whack of cash for a deposit on an IP each year, and each one could be pos geared or pos cashflowed from day one.
Doddle.