While in and of itself, automation may not increase wear, automation is usually associated with much higher usage (made possible by the reduction in fatigue). Most users don't consider automation unless they are reloading very high quantities.
Automation also removes the user from direct contact with the machine, so the chances of feeling something go wrong while using it are much less, so problems tend to multiply more quickly than they would if the machine was being used by hand. Just like your homeowners insurance will go up if nobody lives there full-time, because small problems that would normally be caught earlier, are not caught until they become much more expensive problems.
Andy