right now with the new loot system, it would be almost a waste of time. you can get good bows and crossbows, even masterful quality from the loot. It's just a matter of choosing your enemies well.
I suspect that you even get loot from the nobles you defeat, you could get masterful noble longbows from the battania and sturgia bosses (once I got noble shoulder pads that the only person who had them on the opposing team was the noble who led them)