It's this-away...
Your model 17 has been fired, although it is in still in near mint condition. It is not particularly uncommon, but is scarce in it's present shape. Because of this it can command a relatively high price. If you continue to shoot it, especially a lot, that value will go down, and over time sharply so.
To shoot or not too - that is the question.
Of course those that don't have a dog in this fight will tell you to shoot it, but what ever you do they have nothing to lose. You might.
On many occasions I have picked up guns that I had no intention of shooting. This because for whatever reason they had a value above what a regular shooter in slightly less condition would have.
I then turned around and sold the higher valued gun for top bucks and used part of the return to purchase another one in similar mechanical condition, but more cosmetic wear. As a shooter it would do everything the former gun could. Then I used what might be called "my profit" to buy more toys.
Now in this case they're is another complication, because the revolver was originally purchased by your Dad, and you need to give that some consideration.
But over the long run I have had many more "shooters" then I would have had otherwise because when I happened across a gun that had a higher-then-ordinary value I sold it, took my money, and ran. If someone else wants to degrade something simply because they "JUST HAVE TO SHOOT" whatever they have - well that's their business.
But I'm willing to bet I've had a lot more shooters' then they have, for the total amount of $$$$ spent.