There are several ways to make money off of VR. It is a very new art form, and a lot of applications are still being discovered. Like any new field, many things out there are experiments or funded loss leaders. The major hardware manufacturers have even built software ecosystems by funding developers.
It is a "who came first, the hardware or the killer app" situation currently. Headset sales are strong, although mobile headsets definitely lead the way, with almost ten times as many Samsung GearVR, Google Daydream, and Cardboard headsets as the higher-end models such as the Rift and Vive. The PSVR is a good system, but it can be difficult for developers who are not part of a game studio to get access to.
Don't forget, however, that you don't even need a VR headset to appreciate React VR. Most of the code you work on will be viewed in a browser without entering full VR mode, and many of your viewers may choose to do the same thing. Embedding a VR window on a website will still...