...you have 10-12 people all watching your 5 day listing and yet on a busy Wednesday evening when the auction is in its closing minutes, nobody ends up bidding on it and it sells for a fraction of what you thought it would? Yeah, a bit disappointing.
But oh well, at least it's not quite equivalent to a director making a $100 million movie only to see it bomb badly at the box office! Things could always be worse!
Just move on, forget about it, and I guess...better luck next time!