I hate going into someone else's story with my own story but... Here's mine; tried selling a game on Facebook as well:
*Was going to copy paste the conversation but I can't find it. Anyway...*
I tried to sell Xenoblade for the Wii for like $20. I said I wasn't playing it and "I wanted it in the hands of a gamer". I think I tried to throw in another game. I even said something like "You can take it straight to GameStop and get $20 for it." with a screenshot of the trade in value.
Somehow or another, the convo turned to GameCube games. The girl was admittedly kinda cute but I'm no sucker. She was like "Can I give you $15? And can I have some GameCube games, too?"
So I blocked her.