If I've used the right calculators, a new C172P cost $34,000USD brand new in 1981. According to the RBA, the exchange rate was 91.75c/USD in 1983, which I've used as the conversion rate, so a new P-model would have cost $37,000AUD (I haven't updated the purchase price from '81-83 to give the benefit of the doubt to the Cessna...). Australian inflation since then works out to 214% or from $37000 ->$116,000AUD for a brand-new C172, excluding GST and import duties...According to several articles, you could buy a house for a smidgen over $80,000 in the early '80's, with an average annual income of $21,000, or a roughly 4:1 price/income ratio. In 2015 the average Sydney house price is now over $900K with an income of $78,000, or an 11.5:1 ratio. Based on a $37,000 172 and a $21,000 salary, a new 172 these days "should" cost around $137,000 AUD. The lack of disposable income - a direct result of rampant housing & cost-of-living increases - means most working people simply cannot afford luxuries like flying - particularly on an average salary around $80,000. It is only when you've been able to pay off your mortgage are you likely to be able to afford such luxuries.