I don't get it. Leaving a gun in disrepair or with a rough finish increases the collectability value? If you wanted to keep a gun for collectability and future value wouldn't you store it in a dry place, unfired? People buy cars by the dozen and put them up, and sell them sixty years later for their investment. Other people buy an old clunker and restore them to original condition and sell them for four or five times what they were worth when they were new. Wouldn't it be the same for a gun? When you buy a gun, you buy it to put it to work, whatever work that might be. I could see if it belonged to a famous person like Daniel Boone...Ya, Daniel Boones beater, which would probably be worth a lot of money in any state it was in.
I just got six of my father's guns after he passed on, one of them is a 1926, .455 Webely. It's been through World War 1 and changed hands a couple of times before my dad got it. The gun has worked hard for eighty years. I can count the repairs on it. The numbers on the cylinder don't match the frame, the front and rear sights have been replaced and the original grips are gone and replaced with homemade plastic wood grips. The gun has gone by and will never be anything other than what it is now, but it is a 1926, .455 Webely, eye candy to look at and it's fun to shoot. When I got the guns I posted a thread here and one of the replys was from MJM, who said something like "Use your dad's guns as he intended them to be used and you'll keep his memory", and I do.
Fix em if their broke, refinish them if you got the money, then put them back to work. Good luck, Joe