Is it worth it to reblue my gun?

I have an old Smith & Wesson K-Frame .357 Magnum revolver that I got from my Grandpa. He always stored it in a leather holster and shot it constantly. As a result, some parts has began to corrode from the leather I think and the bluing has started to come of on its left side. I was thinking about getting it reblued, but I heard it can affect the guns value. The gun still shoots perfectly, no problem with the insides whatsoever. So I am asking, should I get it reblued or give leave it the way it is.