David Silversmith has an article titled  The Conumdrum of Enterprise Wiki's on Internet Evolution.

In the article David demonstrates that even hugely popular Wiki's such as Wikipedia  have less than 1% of users actually generating content. It seems that the mwww.wikipedia.org

The majority of us are satisfied to simple be consumers.

David also points out, that in the SMB space, 1% of users is; well, very - very few users willing to contribute.

That is unfortunate as well.

The Internet Evolution article even denigrates Wiki's a bit by stating;

"It's just that instead of fostering collaborative information building, the wikis are just the next in a long line of software to help build knowledge bases. "

My take, even as a simple 'knowledge base', a Wiki can improve organizational knowledge and reduce lost time in searching for previously identified information for reuse.

I have personally seen the low contribution rates to our internal Wiki tools, but when I hear of someone looking for something, I encourage them to look there - and If I talk to someone who has actually solved something, I will even invite them to simply email the solution to me, I then do the update.

In the past that solution would be lost in an archive email, or hidden in some personal documentation.

The Wiki as knowledgebase is still a step above those