I too often wonder just how wide of use the wiki receives. Honestly, I don't think it is viewed much by anyone other than active wiki users. When the site first launched I was very into it. But my interest dwindled the longer I frequented the site. Now I just come here for the content of the staff. I like knowing the wiki is there but the quality varies greatly across the board and even my own contributions are not consistent in quality. Overall, it's a great idea but I am not convinced it is widely used. It would be interesting to see some stats for use of the wiki, but I doubt we'd ever see them.
Good luck with your endeavor. I like it when the community does cool things. I don't want to sound like a downer, but I really think it is hard to get traction for interest in the wiki. But best of luck either way. I enjoyed your post.