I've been running a lightfoot halfling rogue and he has pretty much wiped out Arron of all goodies, plus relieved him of his gold several times. Dammon was a bit different as after I was able to get the primary items that I most wanted from his inventory, plus hit his own gold reserves at least twice, the next time I returned to rob him I was immediately attacked by the tieflings as a thief?
I decided that my last "retreat" from his corner of the Druid Grove had not gone as unnoticed as I had thought, so I stopped entering that particular section of the Grove for this playthrough.
Roah Moonglow has thus far vexed me in the Goblin Camp. She keeps moving around too much, and my stealthy attempts to swipe her stuff have not worked out so far? Admittedly this is a minor quibble, as my two efforts to eliminate the goblin leaders has resulted in my party getting slaughtered (although the second time, I came awfully close to doing so, having whitttled down most with the exception of Gut and a few others who entered the fray at the eleventh hour).