There's literally no reason to keep the penny! We've seen many, many other countries do it with NONE of the negative repercussions the penny lovers prophesied. Prices didn't go up. Charities didn't lose money.

1. They waste time! (we all hate that idiot who counts out their exact change at the grocery store)
2. They waste money! (it costs more to make them then they're worth. It is LITERALLY not worth the space in your pocket to be carrying around a penny.)
3. You can't even use them! (Try buying anything in all pennies. You'd have to carry around a small bag of pennies just to buy a pack of gum. Most newer vending machines don't even take them anymore! I have literally NEVER used a penny to buy something in my entire life.)