Update: In Comments immediately below, anon 9:24 writes:
The problem isn't just that folks aren't updating. The problem is that updates aren't being processed. I haven't checked throughly, but I think that if you make a revision/update to a position already in the wiki, it'll be processed immediately, but if you try to add a new position to the wiki it'll require moderator approval. But the moderator approval never comes through, so new listings in the wiki aren't coming through.Thanks for the correction.