Now, nickels are made from materials that cost more than five cents, so, until next year, when the Feds go to a trash metal, it's a good idea to collect nickels.
FWIW, coins used to have a value based on the metal in them. When governments started using manipulation of currency to control economics, it led to situations where, for example, if a dime was still made of silver, the value of ten dimes would be around $20, not the face value of $1. True metal currency reveals how much the government has debased the value of paper currency by printing. That's why they have to change the metal in coins. I don't think any of the government clones thought we'd reach a point where the content of copper in pennies would exceed the value of the coin, and now the copper-nickel value of a nickel exceeds the value of a nickel.
There's already some concern that the value of zinc will be a problem in the near future for pennies too.