except for the fact there are trillions of coins in circulation and that they'll probably not even be worth anything good not even in 500 years and you'll most likely live less than 100
older pennies and all nickels are worth more then they are stamped to be. and they are still in circulation.
canada had a large program where they were buying back tons of silver,nickel,copper coins and replacing them all with steel.
the US is yet to do such a thing and likely will soon.
those who horde the metals earn