It is a rifle in good condition, but looking at the bolt body and bolt face, it has certainly been used and is by no means what I term "armory mint", so I do not see why further careful and occasional use should make any difference to its value. It's not an automobile, there's no mileage counter, and what counts is how it performs and avoiding dinging it up at the range.
P.S: Looking again at the wear marks on the action components, dinged upper band and chewed-up screw slots, indicating that it has been dismantled on at least one occasion ... are you really, really sure that is the original stock?