Let me tell you the "why", and you won't like it, and the usual housing spruikers will come here to pounce on this, but fuck them.
(TLDR version: Your future is basically that of an indentured servant to pay for the boomer retirement.)
House prices have to stay high so that the boomer generation, a powerful voting block, can stay wealthy and eventually cash out.
Sydney housing is now a global investment vehicle, desirable around the world.
You are competing against a massive global pool of cash.
The world is flooded with cheap money seeking yield (and priced-out perpetual renters guarantee yield until the property is cashed out for capital gains that are magnified by certain taxation exemptions).
Government choke and poke housing policy driven by vested interests (choke supply, poke demand).
High infrastructure charges, levies and taxes on new housing supply.
Chronic underinvestment in critical public infrastructure that would open up vast new areas for housing (high speed rail, quality local public transport infrastructure, outer suburb hospitals, etc.).
Destruction of plans for a true national broadband network that would have opened up region centres to new employment opportunities, innovative services and cheap housing.
Increasing concentration of employment opportunities in major cities.
One of the fastest growing populations in the Western world.
A stable political and social environment makes Australia highly desirable for immigration.
A taxation system favourable to housing speculation.
Record low interest rates.
Ubiquitous TV/media/propaganda that push housing - things like The Block, etc.
Huge hot-money outflows from China, bypassing Chinese currency controls, have been flowing into the Sydney and Melbourne markets.
MASSIVE, active neglect of any form of review of illegal foreign purchases of existing dwellings. Even now the focus is on high-profile, multi-million dollar properties as showcase scapegoats and meanwhile the flood of foreign money continues, and will continue without letup, to distort the market.