Tipping is a thing in Australia, but it's not the pseudo-compulsary thing it is in the US. We do pay significantly higher hospitality wages here; nobody is going to starve if you don't tip, and nobody is going to hold it against you. However if you receive excellent service, it's customary to demonstrate your thanks with a bit extra on the bill, and it will be appreciated.
( perhaps this is all anecdotal, but tipping has never seemed to make sense to someone not in the mix of it )