What percent of people's food and drink budget in Australia is spent on eating out?
In the US, more is spent on eating and drinking out than eating and drinking at home.
Doesn't change the point that restaurants in Australia, and other parts of the world, are able to pay a reasonable wage to their employees, yet are still able to profit from their business. It can be done. It is being done.
And you continue to ignore the effect of training wages. Both have similar effects except a when it's keyed to those just starting out it means later failures have no path back into the labor force.