Okay, not for nothing, but the drop rates in this game are horrible, but seemingly only for sets that people actually use. For instance, I've run through City of Ash more than 150 times in the last few months and gotten exactly ONE BSW inferno staff. ONE. In more than 150 runs.
Now I'm sure someone will come along with all the awesome numbers proving how I'm wrong, but it still doesn't change the fact that the drop rates are horrible for useful bits in this game.