The Wiki only has around 3-5 people editing pages, but it's getting 65,000+ unique visitors per month. The listing pages (by Nationality) are quite popular.
And according to the logs, the Wiki is being posted in a fair number of forums that have nothing to do with sex.
I still have plans for the Wiki, mainly automation. So adding a review to a girl's profile on UKP will automatically update it on the Wiki as well.