Hey mate thanks for bringing this Tax policy to my attention, I didn't know about it and so just looked it up.
It's very interesting and it makes me wonder.
So I'd only pay 15% tax on a super contribution instead of the max of 45%, or if we can get the CGD, 22.5%, which on your hypothetical $100,000 contribution, means I keep an extra $30,000, or $7,500 (if CGD) but that all goes into my super.
Out of $100,000 untaxed income, in one case I get either $55,000 or $77,500 (CGD) of that in my pocket,
OR my super gets $85,000 of it.
Interesting decision to make!
But thanks again for bringing this to my attention
P.S. You can see how much unused concessional contributions you are eligible to contribute by visiting MyGov, ATO.