
330K or 330M?
While the author says that 330M seems a bit high, 330K in the headline I see right now (2:39pm US East coast) seems a bit low...
EDIT: Oh, I see, the 330K figure is from just one study. Doohh. Apologies. PEBCAK.
The small cybercrime ring behind the CryptoWall 3.0 ransomware was able to collect more than $330,607 in ransom from 670 victims, according to new research. The figures, published by security firm Imperva, are based on an analysis [PDF] of Bitcoin wallets linked to malware-wielding extortists. Security researchers discovered …
They do take them down every now and then, almost always with a lot of publicity and banner waving.
Why take them all down at once when it is more benificial to do one (orchestrated) highly visible takedown at the correct time and milk that for all it is worth. Usually this happens around the time their budget is up for renewal/review and they use the "success" as an example of why they need extra funding to catch more gangs and extra powers to make the identification of the gang members easier.
If they were doing the takedowns every couple of weeks the media would soon tire of it and the public visibility would be reduced thereby reducing your bargaining chips come budget renewal.