And yet Hannah seems to get more attention. Why? Weird example I know but there's a point:
Most of the case studies, conversations, books, assignments done in class at BYU or Harvard are probably identical. The biggest difference is the network of other likely highly successful classmates you are rubbing shoulders with for two years. Not to mention how MBA - Wharton looks compared to MBA - BYU/Utah/ASU etc. It looks SO MUCH BETTER.
In reality, success doesn't come solely from an MBA. It comes from your ideas and your efficiency in implementing those ideas. It just so happens that 44% of all billionaires happened to go to ivy league/other prestigious grad schools.