Those are entirely different concerns. A professor dedicates his career to advance his field of expertise. If you spend 5 years of your time and resources on a

Those are entirely different concerns. A professor dedicates his career to advance his field of expertise. If you spend 5 years of your time and resources on a student teaching him to be a leading mechanical engineer but in the end after he graduates he decides to pursue a career as a pastry chef, you'd feel you wasted your time with him as well.