[creatornator]

That's a backwards interpretation of demand. Buying a good has the effect of increasing scarcity and thus increasing price.

You could just... decide not be in the market, despite being able to afford it. Market price is defined by what people are willing to pay for and sell for. If you are not willing to pay anything for a luxury condo, that reduces the price for everyone by making it less scarce.

You don't have to buy all the luxury condos in existence to eliminate the market. If people decide not to buy them, there is no demand, by definition.