Um, it is simply very expensive to create a good VR experience. It's not expensive BECAUSE of network effects and economies of scale and corporations. It is only POSSIBLE and AFFORDABLE because of those things.

For another example, to make a modern movie can cost hundreds of millions of dollars. It is only possible to make them because there are many people who will possibly watch it and pay for it. Nobody would be able to film the Lord of The Rings trilogy in their own basement just for their own entertainment. Not yet, anyway - tools of the future may make it possible ("GPT-300, make me a good movie based on the LOTR books").