A CNC lathe (turning center) rotates the workpiece against a tool to make round parts. Modern turning centers add live tooling, sub-spindles, and Y-axis to do milling in the same setup. Value drivers include chuck/bar capacity, turning length, tooling, and the control.
See every Turning Centers & Lathes in the reference library, by make and model.
How this affects buying and selling: read The Gauge, or value any machine free at The Machine Blue Book.