Ok this is just my opinion. Clearly I think this is what happens.
So, when a new user comes to see a wiki that meets their intrests they notice the chat. Then they make an account and then the whole researching thing is ablolished in that users tran of thought because they notice the soical oppurtunites.
The socialness is distracting the new users from edting and veiwing pages that us users have been working so hard on. I only go on pages to edit them. I think the socialness of the Wikis is distracting the new users from edting and researching.