Americans don't really use coins. We collect them, take them to the bank to get the amount converted to dollar bills we can spend and then it's back to collecting coins.
Although it would show a huge savings after 30 yrs, I doubt it'd be the wisest choice. Just look what was said... 1.1 billion one dollar coins sit in vaults unused. Why waste money on something that will just get stored away?
Have you guys seen "MAD MONEY"...this topic made me think about that movie. Check it out if you haven't.