There is value in collecting misprinted currency. As the mints employ checkers to inspect the notes, misprinted currency is rare. Misprinted notes are typically worth three times their face value.
Absolutely. As with anything rare and unusual, people love to collect things that are unique. Especially something that shows the governments blooper. hha
Misprinted currency is generally rare and there is quite the market for it right now. There are many online sites that offer currency value guides. Search for your currency there.