I actually had to think a little under what forum topic to post this. Today I went to the Mid-west Central States Coin show to sell some coins I no longer wanted. Several were NCS slabbed and a few not the greatest for their grade. All were slabbed but one. I thought I did alright, all things considered. When I got home, I looked closer at the bills the dealers gave me. I ended up with three star notes. Two sequential $100s and one $10. None of them appear circulated. No folds, marks or soilage and in very crisp condition. They are from the 2003 series and 2006 series, so they aren't old enough to have extra value yet. I guess the coin dealers must not check their currency like we collectors do. I just thought this very ironic, and made my sales today even more gratifying.
This isn't the first and I'm sure it's not the last time I've heard of stories like this. I do have a theory. I have a feeling that collectors upgrade at coin shows and this is where stars and repeaters and etc end up. Just an idea since I have heard about stuff like that happening at those shows.