There's nothing wrong with a little wear on the finish. It gives a gun character, just like those wood grips do. I firmly believe guns are made to be carried and shot- not to collect dust in a safe or under glass like some postage stamps or something.
Couldn't agree with you more. Just like having a car that it never driven - if you don't at least shoot a gun, it's failing to perform its intended purpose. I have certain ones I carry (lightweights), but I love to shoot old Smiths.
Very nice collection you have there, BTW.