Did You Know It Costs More Than a Penny to Make a Penny?
gizmodo.com
gizmodo.com
By your logic, if we could make a penny out of Adamantium that cost a trillion trillion dollars to make, it would be worth it, because the penny would last forever and be re-used an infinite number of times. But the cost of the penny to the government is not amortized across all the transactions it is used in UNLESS the government is a party to all those transactions (which it is not).