It looks like many of the pretend or fake profiles are being deleted starting the week of Nov 8, 2010. I assume this is an action that admins of geni.com are doing directly.
I've started a new section on the project page called "Our Morgue of Pretend Profile Names That Have Now Been Deleted" to just keep a list of these now profile names. These names tend to get used over and over again and are pretty popular. The thought is that they might be useful as search terms to find additional future fake profiles.
--Randy