Why is Australia tuition so expensive?

Could you elaborate on the reasons behind the high tuition fees in Australia? Are there any specific factors that contribute to this cost, such as the quality of education, the demand for international students, or the cost of living in the country? Additionally, how does the Australian government and universities address the issue of affordability for students, especially those from low-income backgrounds? Is there any financial aid or scholarship programs available to help students manage the cost of tuition?