Reliable estimates for how much the certification for valuing investments adds to a resume are virtually non-existent. While nobody’s saying it’s worthless, test-takers who typically pour more than 300 hours into studying for each level and spend thousands of dollars on fees and materials do it despite harrowing statistics. Four out of five who start the process drop out. The odds of a big immediate payoff appear to be low. Bloomberg's Jenny Surane has more on "Bloomberg Markets." (Source: Bloomberg)