Public schools/universities are subsidized by the government. That's why international students pay more fee than domestic students.
If they can afford 3x the tuition , they shouldn't have to apply for bursaries.
Work on campus opportunities are offered to underprivileged students( those who have student loans, disabled etc)
It doesn't matter what your situation is, in the eyes of govt and university officials you're rich. Therefore, you don't qualify for any of those.