Killed tons of Tribe Vrodak kobolds in Solusek C off and on, finally became dubious to fire goblins.
Sadly, nothing responds to hails, and some goblins (like PH for the king) are still scowling. As everyone knows, the goblin merchant can be accessed by sneaky classes, and holds nothing of special value. I searched and waited for named to spawn, such as Tisella, and they had nothing to say. So, it appears this faction only exists to serve in opposition to the Tribe Vrodak faction.