As someone peripherally involved with certain VR indie communities, I'd say it's simply that indies do what they want, and there are a lot of people who are extremely passionate about VR. As far as money goes, VR users are very hungry for apps right now, so it's a small but vigorous market.
Platform launches are always a good opportunity for niche games and new IPs because early adopters want to justify their purchase and with a limited library are more open to buying games they wouldn't buy otherwise.