To determine the value of an item, one must take into account three factors, condition, rarity and desirability.
Condition starts at perfect and works its way down. Collectibles
of the sort we are dealing with were not designed to last for years.
When a relic is found the degree of its preservation is
determined by either foresight or luck. The laws of physics
remind us that all things will decompose eventually: Therefore
preserving your collection requires effort. All valuables
should be kept out of basements, garages and attics where
temperatures can vary wildly and humidity can be high.
I have stopped being surprised when collectors, opening their boxes of cans for the first time in years, tell me ?Boy, I remember these cans being in much better condition!? Even collectibles protected in climate-controlled rooms are not immune to tarnishing, fading or drying out. Preserving these treasures requires maintenance. While you own them you have a duty to keep them well.