When I was younger (like late 20s), I remember watching an infomercial about the power of trading stocks. It was a "CD/DVD kit" where they teach you how to make money trading penny stocks and shit like that.

I remember talking about it with a co-worker and he said something like, "If they really made all that money, why would they have to sell the kit?"

My response was, "Maybe they want other people to know how to do it to."

That conversation lives rent free in my brain because I realized years later that that's what business school is: a bunch of people telling people how to run a business profitably. If they could make money doing it, they wouldn't be teaching it.

I know that's not what business school is but damn the analogy still fits.