I just saw a video of some guys who went to a kiosk, inserted about $650 US, and got their bitcoins. They went and bought a taco from a food cart. The next day they came back to the kiosk to see how many bitcoins they had left in U.S. dollars. They had $560 left, and the kiosk was unable to give that cash back.

http://youtu.be/vnm4xFC2xNo

I superficially understand the explanations of how bitcoins work, but where the rubber meets the road, bitcoins look and smell like a scam. That disconnect causes me to revisit the explanations and wonder if the explanations are wrong or if something HUGE is missing from the explanations.
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If you're reading this, it's too late.