I am subscribed to a Google search for my name. I found a site that promises to compute the “value” of your website and predicts the expected ad revenue.
For Emacs Wiki they say the following:
I guess I’d love to get $30 per day for not doing anything except paying about $30 per month. 
Google Analytics says that Emacs Wiki gets a bit less than 6000 visits per weekday and a bit less than 4000 visits per Satuday and Sunday.
I somehow doubt those numbers, however. What do you think?