Maybe the best argument for taking a behavioral finance class is to know what things people are prone to fall prey to and thus be ready with defenses to beat the issues. Which in a nutshell is the view that Joseph Grenny takes in his book. Here he speaks at Google about how to not fall into the same old traps.
"Why is it that 95% of all diet attempts fail? Why do New Year's Resolutions last no more than a few days? Why can't people with good intentions seem to make consistent and positive strides in the way they want to improve their careers, financial fitness, physical fitness, and so on?
Based upon the latest research in a number of psychological and medical fields, the authors of Change Anything will show that traditional will-power is not necessarily the answer to these strivings, that people are affected in their behaviors by far more subtle influences. Change Anything shows how individuals can come to understand these powerful and influential forces, and how to put these forces to work in a positive manner that brings real and meaningful results."