I wouldn’t mind betting the median wage in Newcastle is higher than Adelaide.
2021 census data
For the 348,539 population Urban Centre of Newcastle
$1,708 median household income
For the 1,387,290 population of Greater Adelaide (includes Adelaide Hills and other outer suburbs)
$1,548 median household income
Though there are 2.4 people per households in Newcastle and 2.5 in Adelaide, and there are some cases where treating a household as one purchasing unit is not always appropriate (sharehousing). But also, we shouldn't count children who do not have income to spend.
You're completely right, my apologies.
I should stop being so sanctimonious, I could learn a thing or two!