Should I hold on to that jar of pennies I have? If I wait long enough will it be worth real money?
Jars of pennies (and I have one as well) is one reason why we can't have pennies.
Metal coins are supposed to have a circulation life of something like 20-25 years but nobody circulates them anymore. They just put them in a jar and forget about them, requiring the treasury to mint new ones, offsetting the number that are sitting away in jars somewhere out of circulation.