The problem with beating yourself up over loosing an eBay bidding session, and I have lost my share, is that you never know how high the eventual buyer was willing to go. It seems like a few bucks at the time, but they might have been ready to bid a bundle. All you can do is set yourself a reasonable limit, stick to it, and put it out of your mind if you don't get it. But talk is cheap when it's someone else I am advising, I feel your pain and frustration my friend.