According to an article published by Information Week massive amounts of revenue are being taken by cybercriminals. The author states that more and more insufficiently knowledgeable computer users are being taken in by this scam. The typical scenario involves the user’s machine getting infected, then the rogueware informs the user that their machine is infected and for a small credit card purchase they will clean the infection. The user pays the money but the infection remains. Panda Software estimates that 35 million computers are infected with rogueware every month. The amount of money being taken by these thieves is staggering. Estimated to be $34 million per month.
I can verify this, as an increasing number of my calls involve cleanup of this garbage from infected computers.

Read more here: Fake Security Software Steals $34 Million Monthly