I dont, reasons being many.
First off due to the melting law against pennies.
Second Even with copper prices high right now. Does not mean that someone is going to pay you full spot value for them. So even if you did have the resources to "melt" them down, no one is going to pay you the daily spot price for the bar. Your just going to get a % of spot. They have to make a profit to buy it and resell.
3rd the only way it would really be profitable is if you were a metals recycling company and set up to do it on a massive scale
4th, Ebaying them off to people who would buy them at a premium will only do so for so long. As well. If you run the numbers for the time put in. fees, shipping, time to do the auctions and all associated costs. Its losing money and time better spent doing other things. maybe some people can get a fluke and make a decent profit some times, But over all its not even at todays prices a very profitable venture for the individual.
I will admit that I have a few rolls and a small box of old copper cents that are 59 to 82, As we would use them when we needed to alloy down fine silver to sterling. However with the melting law that stopped. But even then the most we ever used was 10 a month. We just use copper pipe scrap now. I also have a couple rolls of metal detected coins. just never had a reason to spend em really. They just sit there.
Yeah I keep em around, mainly so my kid can look though em when he gets older if he wants a collection. Its maybe $10 face worth. All collected from pocket change and not from CRH. But I also forget that I have them as they just sit in a shelf in a closet. Just like many coins do.