I am not a collector, I would not buy a 520, but I if somehow I got an unfired 520 gifted to me I would not shoot it.

I do have a couple of S&W's I have not shot, I have had them for25 or 30 years. They are spares, in case I wear out or break one of my shooters.

Until I need them I will not shoot them. No reason to.

Now do not let this post, in any way, indicate that I have any disdain for Collectors. I have known several people that are, and I admire their Collections.
To me Collectors are preserving History.