I still disagree with your post that a coefficient of 0 for you in someone's mind implies murder for pocket change.

I believe this is exactly what it means, unless there is a chance of punishment or being hurt by victim's self-defense or a chance of better alternative interaction with given person. Do you assume that there is always a more profitable interaction? (What if the target says "hey, I just realized that you are a psychopath, and I do not want to interact with you anymore", and they mean it.)

Could you please list the pros and cons of deciding whether to murder a stranger who refuses to interact with you, if there is zero risk of being punished, from the perspective of a psychopath? As I see it, the "might get some pocket change" in the pro column is the only nonzero item in this model.