Are you sure? Valve don't allow account sales and if we use this auction as proof for recovering when you make a dispute, there is a high chance that they will either ban it or give to real owner.
So many people sell and buy accounts. Not just now, it is since Steam was made. It's bad thing that you cannot trade game from account that it is already there (not the gift ones), so people sell their own accounts to get some other games. I did it a few times too. It's not a big deal.Not a big deal unless OP file a dispute.
Did you had that experience?