I think the answer that it would jeopardize their source is a valid answer to that question.
Agree. Frankly, I think people who keep attacking CF for "not disclosing sources" are about as clueless as the Hashtards. In the U.S. at least, reporters have a long and storied history of keeping their sources secret and many reporters have gone to jail rather than disclose sources even when ordered to do so. A free press is pretty damn important to democracy. So wtf with all the "show me your sources" crap? Get the f*(Jk over yourselves.
I have no idea how CF gets its info, but I greatly respect a news organization that can get to the truth repeatedly, over and over again, long before anyone else. Not just with GAW but Mt Gox and other stories.