Any limits on the number of wiki users?

I have a site where there may be upwards of 5,000 users. They want each user to be able to maintain their own page(s). Some people might only have one page (like an “About Me” page). Others might have 3 or 4 pages (“About Me”, “How to Contact”, “Favorite Links”, etc.).

I am trying to figure out the best way to attack this. I am thinking that maybe the Wiki module would handle this. Each user would be their own individual Category. But then they may belong to other categories (“Artist”, “Pennsylvania”, etc.) so they could be found via various groupings.

Each user would be the only one with rights to edit that particular wiki page(s), so that they are solely responsible for the content. They can be as reticent (1 page) or verbose (10 pages) as they want. The styling option might be somewhat limited, but at least the content could be controlled and extended by the user/owner of that particular wiki section.

How does this sound? Is there a better way?