Wow. He could probably make some good money off this as is (if that was his goal), but I imagine if he added VR support, he's probably get money from everyone that bought a headset.

Projects like this always ended up being more fun for me to play that the vast majority of released polished games. Part of that is probably seeing updates happen that actually change the game. There's something visceral about that feed of updates, and feeling like you're there as something is being made. You can do a lot to engage a user base that way.