I have posted answers to questions like these in several threads and will reply here as well.
1. To someone making $10/hour at the local Dunkin Donuts, prices paid for a registered magnum or the OP's guns seem like lottery numbers. To the guy that just sold his dot.com company for 6.2 billion to that Japanese conglomerate, it's the pocket change in his left front pocket. It's all relative.
2. Will the guns go up in value when they are sold again in 10 years or 20 years or 50 years. I'm pretty sure the OP doesn't care. He bought them because they hold significance to him now and he derives pleasure from holding onto a part of history for the blink of an eye that we spend on this mortal coil. It's the same joy that someone else gets buying that 63 split window corvette, or that fishing boat or 75' yacht. (Again price is all relative to how much denaro one has)
I would love to own a revolving rifle but the $40,000+ price tag (and I'm only guessing on that) is a little out of my wheelhouse. However, if I ever do hit Powerball, watch out.
Bottom line, all purchases are made to bring joy to the owner and are usually the reward for hard work or dumb luck. Be it a few beers on Friday night or the OP's guns or that 75' yatch, if it makes you happy, go for it.