When mediocrity becomes tradition

I read a very interesting article today which had this astounding heading:
For the first time in 40 years, supercar maker Aston Martin has turned a profit.
This news has really made me rethink why I even bothered with business school. If a company can be run so poorly for 40!!! years and still survive, why do I need to be knowledgeable, or dare I even say good, at my job? I can just go work for AM and call it a career.