I had this one incident where I was selling something and the winning bidder looked pretty trustworthy; a few dozen positive feedbacks, a member for 2-3 years, from the States, the whole deal. So a few hours after the auction ends I get an email saying they needed the item shipped to India because they were visiting family and didn't want the item sent to an empty house. To the average, non-common sense using user, this might seem like a reasonable request but it's bullshit.
So I refused the deal, reported the account to eBay and the next day got an email saying the real account owner's account had been "compromised" and that they were looking into it. What really sucked is that it took 2 months to get a refund for the cost of putting up the auction (listing fees), and the final value fee from when the item sold. Since it was kind of an expensive item, and eBay already rapes it's users on fees, I was out something like $30 until it was finally refunded.
So again, buyers can avoid trouble with common sense, but wheres the protection for sellers? We can't tell off the bat when someone steals a legit user's account and then tries scamming us AFTER the fact.
I really hate eBay.