While I am a capitalist at heart and I have no problems with commercialization as such, I believe that while it's okay if education becomes a profitable business, it's not okay if it becomes corrupt.
Let's be honest: the trappings of investment banking are quite tempting. I do miss it sometimes. And to be honest, there was a time I'd read the 'WSJ' in the morning, and for years I have done that.
I myself don't know what makes my books work. I enter a bookstore and I'm frankly overwhelmed by the number of books in most of them, and I know people are buying mine.