Yes. I compared Narcissistic Supply to drugs because of the almost involuntary and always-unrestrained nature of the pursuit involved in securing it. The narcissist is no better or worse (morally speaking) than others. But he lacks the ability to empathise precisely because he is obsessed with the maintenance of his delicate inner balance through the (ever-increasing) consumption of Narcissistic Supply.
The narcissist rates people around him according to whether they can provide him with Narcissistic Supply or not. As far as the narcissist is concerned, those who fail this simple test do not exist. They are two-dimensional cartoon figures. Their feelings, needs and fears are of no interest or importance.
Potential Sources of Supply are then subjected to a meticulous examination and probing of the volume and quality of the Narcissistic Supply that they are likely to provide. The narcissist nurtures and cultivates these people. He caters to their needs, desires, and wishes. He considers their emotions. He encourages those aspects of their personality that are likely to enhance their ability to provide him with his much needed supply. In this very restricted sense, he regards and treats them as “human”. This is be his way of “maintaining and servicing” his Supply Sources. Needless to say that he loses any and all interest in them and in their needs once he decides that they are no longer able to supply him with what he needs: an audience, adoration, witnessing (=memory). The same reaction is provoked by any behaviour judged by the narcissist to be narcissistically injurious.