A demographic so small as to be irrelevant.
The tax paid by someone on $50k is, at some level, going to be put towards paying for the maternity leave of a woman on $150k, just like the tax paid by someone on $150k is, at some level, going to be put towards someone's pension.
The people not paying their fair share, are the ones benefiting from broken ideas like 50% CGT discounts and negative gearing, not the mug punters on forty grand a year who need rental assistance so they can afford somewhere to live.
The Liberals mantra may as well be: "If you don't need help, we'll give you as much as we can and make you feel entitled to it. If you do need help, we'll give you as little as possible and make you feel guilty about it."