Quest is only expensive because it comes with all the processing infrastructure. Meta, as well as Apple and others, can split it up and offer a phone that can be connected to a VR headset. With subsidies, VR could be as cheap as $100. Why would somebody buy a big monitor or TV for gaming if they can have 3D for less?
Facebook has to spend now because there is no way to participate in the Metaverse if Apple was able to establish their platform. People shun green messages, they will never meet somebody who doesn't own Apple iGlasses or whatever they will be called.