Education's general value is subject to the law of diminishing returns. Once you have learned to critically study and learn a subject of your choosing the value of education is mostly related to the value of what you produce from what you've learned. A hermit who learns the secrets of the universe and doesn't share is of no real value. A history (or engineering) major who doesn't learn how to apply what they've studied is of little use. I think it's just generally easier for engineering majors, or business majors to apply what they've learned.