I wasn't a party to this, but I saw it and I couldn't help but wonder.
Basically a guy listed a scope for $100. Within 10 minutes a guy said he would take it, several more people quickly said they would take it as well. He then logged on and said that he made a mistake and it was actually $120.
I know $20 isn't much, but I can't help but wonder if he realized he posted it for a lot less than he could've gotten for it, so he decided to go back and change the price.
Just seems all around dishonest and that he should've honored the original price, but that's just me.