A VMC is a machining center with a vertical spindle over a horizontal table — the most common CNC machine in job shops. Value tracks travels, spindle power and speed, taper, tool capacity, and the control. Its versatility and huge installed base make it a liquid, easy-to-resell class of machine.
See every Vertical Machining Centers 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.