The six cents balance marked as "available" was also from fake transactions. Those transactions cleared after 60 days. If the system was automated, those transactions should have been canceled. I don't think they will actually do any checks until I try to withdraw the money. I don't plan to try that though. I think the part about blocking another person's transactions is actually the interesting part.
http://www.permuto.com/blog/2010/02/27/what-are-people-reall...
Maybe I'm interpreting the Milo graph wrong.