I see the logic and simplicity of your suggestion, but while this suggestion would probably work, it would take a lot more work and space.  Our company (I have a boss to report to, thus my impatience and trying to tackle this problem myself) would have many groups, possibly hundreds.  In order to make a wiki with different view and editing rights depending on those groups would be crazy.  It'd be a pain just to make all those pages and wikis.  It would then take a lot more space in the server and database.  If we only had, like, 5 user groups, I would be down to using your suggestion.  However, in our current situation, I don't think that would be a possibility.

Thanks for your input, though!

Also, if someone could please shed some light on what I'd have to do to get rid of those errors in the wiki source so I can try to build it, I'd really appreciate it, and would be more than happy to post the completed fix.