I think its already confirmed that if your bitcointalk account is hacked and used to scam then you are responsible. At least that's what I've always thought and what would be the most reasonable in my opinion. It seems there is some confusion though when using a 3rd party source of communication and it gets hacked and used to scam, people think they aren't responsible. In my opinion you're the one taking the risk and you should be held responsible, not the unsuspecting victim. It also opens the doors to fake scam attempts.

That also doesn't strike me as entirely fair. If nothing can be gotten from the person who actually did the stealing, then the person who lost the stolen item and the person who bought it should somehow split the cost IMO.

I think that marcotheminer should return the account now since it was probably hacked, but everyone should give yussuf89 negative feedback for being unable to stand behind his account's actions unless he pays 50-75% of the loan principle. (This is just my opinion -- I'm not going to try to enforce it.)