I did not know that. It seems to be a bit of a compulsion with him. If he goes too long without creating gold, he gets nervous.

[Granted, Maul's reasons weren't entirely altruistic but he's never claimed to be a saint or even a good person, which most of Trench already knows. But it had both gotten them something they wanted, so where was the harm in that?

He does give a genuine grin when Lysithea days she's trying to teach him communication skills and she gets to be witness to one of the rarest things that Maul can be seen doing: giving a genuine laugh. When he done, he still looks amused.]

You must enjoy efforts in futility. I suggest banging your head against a brick wall if you want the same effect.