User blog comment:Omega natsu2/Chapter 359: Fairies vs. Hell, Predictions./@comment-94.13.89.18-20131116204247/@comment-7418318-20131117100059

I imagine Crime Sorcière has the same problem as Fairy Tail. They probably don't know where to find Tartarus.

So they can either stumble around blindly - a method with which they might search for decades without ever finding them - or they can go to a place where they know a Tartarus member will show up.

Apart from being able to thwart the Dark Guild's plans, they might be able to either capture or somehow mark a Tartarus member and thus have a chance to find out their position.