My Dad, at one time, never had alot of guns, raising a family and such made it tough. He owned a pre 64 Model 70 Winchester, 264 Magnum, bought new. Things came up and he had to sell it. He regretted it and still does to this day, at 87 years old. Since then he has bought and NEVER sold a gun. I at one time bought, at a good deal then sold to make a little money. I also sold some because I needed the money and thought I'll get another one when I can. Problem was, and one I didnt think of, When I finally got around to getting a replacement they were gone from production. A Savage model BSE 12 ga, 26" bbl, imp/mod, comes to mind. The Northwoods grouse never had a chance when that came to the shoulder. I fortunately, sooner more than later, heeded my Fathers experience and have not sold anything I've acquired since. The money you get for your property has soon vanished, a fine firearm will always be there.
Besides that, I worked with guys that were half my age, all were into hunting and guns. We'd talk and they would bring up a firearm and Id tell them more times than not, Yea, I have one of those". In that case its not what its worth, its that I have one and they dont!