"Roj approved- Sure you are missing out on interest, but your also not paying any ta
If you are a non-resident of Australia for tax purposes then the only Aust tax you are liable to pay is withholding tax on the interest you earn on your Australian bank account funds.
You will find higher interest rates avail in Aust (eg UBank), than offshore ( AUD accounts ) so the 10% withholding tax on interest earned in Aust should be covered.