My theory is that people have invested their time in watching an auction for however many days leading up to it. When it's time to bid they are less likely to "let it go" due to the time investment as compared to a fixed price item that may likely be there in a few more days/weeks, etc. Subconciously, people want to see a positive outcome to their time investment....aka...winning the auction even if it means paying more. Just my thought.
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