No you're not. If you buy a luxury condo, you have reduced demand for luxury condos, since there's one less individual who both wants and can afford a luxury condo. If they build enough luxury condos as people who can afford them, then eventually it's no longer profitable to build luxury condos, and they'll have to concentrate elsewhere. However, the false restriction of the market enabled by policies such as 'neighborhood preservation' and lack of funding for rapid public transit means that development companies can basically make their entire year's profit only meeting the demand of the rich.
(Also, every new development is going to be branded as a 'luxury condo'. No one sells a 'boring old condo', ever).
> There's no winning here.
Yup. If you define 'winning' as 'I don't want my purchase of something to affect the price of similar things', then certainly, you cannot win.