About 87% of affluent Sydney residents have a credit card, higher than the regional average of 69%. Wealthy Sydney-siders are charging an average of $2,214 to a credit or charge card per month, far higher than the regional average of $1,253 per month. At the same time, the average household income for Sydney’s affluent residents has increased in the past 12 months from $10,350 per month to $10,977 per month.