These are the sort of people that need to find it easy to use, they may be wanting to contribute to project in some way, but don't have experience in areas like programming. Adding to / updating the wiki would be a great way for them to do that.
Some of this feeling comes from my first experiences with the wiki, my first 10 minutes were spent looking for the "add page" button or link.
The fact you need a page on the wiki describing how to add a page, sort of highlights my point (& that page I found by accident).
A WYSIWYG style editor wouldn't hurt either.