There are millions (or maybe billions) of scam sites on the net. Not all of them claim to sell "stolen" e-books. Some of them claim things that are completely legit. There are also plenty sharing sites that require absolutely nothing out of the user and as I understand, these sites are the ones with heaviest traffic. The example you are showing in your post has nothing to do with shared. It has to do with common human greed, and attempt to find criminal ways to take advantage of the unstable situation. Sort of like war on drugs. You criminalize drugs, and give way to a wave of new crime, related to you criminalizing drugs. Of course this isn't easy to solve - both outcomes being evil: either letting go of ideals and principles, or continuing to spend to fight a war that you cannot possibly win.
What Cory Doctorow keeps repeating: one of the great reasons why his e-books are free, is because it makes the whole thing mute. If the e-books are already free, and available on all well-known sites, there is no reason to go after them to the fishy sites. Of course Internet scammers will find way to scam others with or without Doctorow's e-books. 
Lastly, you will never find out where the scammers are sitting, not by information you will find on the web. They often use bots/zombie computers to avoid being tracked down. It takes entire teams of "counter hackers" to track them down. As I think Wiki claims, most Internet scammers are located in China, Eastern Europe and parts of Africa.

Sasha Barin