They are, apparently, the crappiest bunch of smuggler's ever.
This might be a good place to put some of that more interesting rogue gear. Sneak gear, short sword drops, rapiers, etc.
Especially on their 20th level assassin/fighter boss.
What, there's no 20th level assassin/fighter boss? Well, guess there's something else for you to work on! (Yeah, a boss would be nice. Dungeons without bosses are like Playboys without porn stars.)