The bounty was $300, but today someone contacted me after they felt moved to chip in an extra $200, no strings attached, and anonymously. They said that they wanted to see a good VR wiki being built (as do I). Awesome!
If you have a VR Wiki that nobody knows about or you think you might want to compete for the prize, please visit the thread on reddit at the link above. So far, there appears to be one official entry, and another likely entry.