Grey laughed briefly, shaking his head. "Automation, my dear girl. Automation," he explained, tapping his temple lightly. "I do not have access to the Federation budget on the scale of some more... official operations, and so I cannot afford a live crew and their wages. I am, however, resourceful enough to be able to maintain this ship and a sufficient crew of drones and autonomous units with my own efforts."
"In short, if you want living crew... well, you're looking at it," he said with a smile. "Of course there are still my passengers, but there's not that many of them at present, and their quarters are in another area of this core."