You make perfect sense, Jager, if you're into markets, retailing, buying to make a profit, as grocers buying low and stocking shelves as their wares go out the door.
Choosing wisely to "retain or increase value" would take the fun out of guns for me if the primary value you express of buying old guns is to make money.
As an old man of winter, the value of my guns is the pleasure they give me; even from the glance I give all of them as I choose the lightest "best" for the role.
It's been the SKB 20 Kent TM every day this week for decoying ducks and geese. When it's gets serious, the others get their turns to please me equally.
You know more than a little about guns, Jager. Choose one that fits and you can shoot well. You can't lose. You're not living if you're not having fun.
(I enjoy reading your messages.)