Do you think everybody's house is on the market?
I bet if I offered you a billion dollars a square foot you'd sell you beloved childhood home. And If you're the 1 in a billion who'd turn down that deal with that amount of money on the line, I can simply bribe the local government for them to expropriate you.
Housing prices (in certain areas) are high due to low interest rates, covid related demand changes (moves of high income earners from core cities), and wage growth for high income earners.