Honestly nickels and dimes, and maybe even quarters, should go too. It's ridiculous that we don't have $1 and $2 coins in widespread circulation in the US (we have a $1 coin but nobody uses it).
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I've honestly never understood why this is a valid reason to object to the coin. Coins aren't used only once, so that they cost most to make than their face value doesn't seem very important, unless the differential is much, much larger than it actually is.