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TBob4. Greed. The chance to get a tremendous bargain on a card because you believe the seller doesn't really know what he has.
5. Impulse. This occurs most frequently at night or during the closing moments of an auction and is closely related to #4. The thought that someone ELSE is going to get a great deal on that Ty Cobb bat on shoulder card that was given to the seller by his grandfather, is hard to stomach.
6. Ego. The thought that no one else has seen a card yet (BIN fever) or if they have, no one else is smart enough to realize what a great deal this is.