That's a very interesting auction...
10lbs of pre-81 pennies. Starting bid, $25.99.
Those pennies are bronze.... 95% copper.
Wiki says a roll of those pennies weighs 5.4 oz. 10lbs is 160 oz, so you should expect basically 29.5 rolls of pennies. There's 50 pennies in a roll, so that's $14.75.
Commodity price of copper is about $3.80 (yeah, I know it's completely different than market price) so 10 lbs is $38 * .95% copper content, $36 bucks.
Shipper is shipping free, which is, what $3.75 for a flat rate box? So shipper's cost is $18.50 + handling.
Assume the package sells for $26.
Shipper makes $7-8. Buyer makes $10....
Of course...
melting coins is illegal and you'd never find somebody to pay you $3.80/lb for pennies...
I love trying to work through "deals" like this to their logical conclusions. It's almost like a betting system.
It looks like it'll work... but then it never does!