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A reason this disparity sprigs to mind has to do with age. I'm reminded that the translation of sophomore from the Greek is "wise fool": it's possible high school students at the ages of 15-18 are more willing to plow ahead with ideas that others think through and then dismiss. Of course, there are famous contrarian ideas that flourished and have changed the world, and most of us know that execution of an idea, along with pivoting, is a road to success. But I would never form nor invest in a company that hands out umbrellas when it rains for the same reason I don't sell Gatorade at little league baseball games: limited, fixed market, no barrier of entry, etc. Isn't it more likely an MBA considers ideas akin to this, thinks through the angles, and then discards them many times over, such that it appears to the outside observer they are timorous?