Common sense isn't all that common I guess. The best of this type of scam occured when someone hacked the twitter accounts of famous people like Obama, Oprah, Clinton. Then they asked for people to send various amounts of bTC, I remember coinbase had to freeze some accounts to prevent foolish people from sending thier BTC to the scammers. It will probably keep happening and some of us have to learn the hard way.
Thank you for sharing :}