This is a very interesting link. It shows Sinbad received bad money even before they started. It looks more and more like they weren't "a good site also used by bad people", but they were "a bad site that needed good people to hide their bad money"! If that's the case, they had it coming. But taking down this site won't change anything except for slowing them down. Long-term, they'll continue elsewhere.
As much as I like privacy, I don't like criminals. And especially criminals who abuse good people's need for privacy to hide their own crimes.

I've seen those offers on Bitcointalk too: "old Bitcoins" for "new Bitcoins" at 10% discount. It's either a scam, or shady as hell.