I think that likening a drow to a used car salesman doesn't indicate the depth of the relationship between the Drow and the rest of Thera.

It seems to me that an encounter with a Drow is going to be much more akin to a run in with a Nazi. He may be exceedingly well spoken, profoundly intelligent, dressed impeccably, and telling you all the things that you want to hear. However, at the end of the day you know that unless you fit into a very narrow demographic that he does not have your best interests at heart.

You may want to trust him. You may find him endlessly charming. You may even truly enjoy his company. But all that charisma will be undone by the fact that you can clearly see his motivations because he wears them on his sleeve.