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HankronBob, your three points are all valid (greed is the one that usually comes to mind, and also impulse buying), but I believe that they will fall within my three, or be rendered harmless by following the three. For example, impulse buying of a way overpriced item is almost by definition buying before doing one's homework(#2). Greedy buying of a AAA card because it's so cheap, is an example of #1 and #2. Buying that Babe Ruth autograph because it's only 15 percent of the price of all those PSA/DNA Ruths is, to me at least, an example of not using common sense ('Why is this Ruth so much cheaper than all the others?').
Like going gaga when introduced to a beatuiful woman, greed can make even the best of us loose our heads an act like dopes.