Intelligence about the opposition is a powerful tool. World governments rely on spies to gather the information needed to assess potential threats to national security. Pro teams make a point of reviewing game films to see what they did wrong and how other teams handle certain situations. The same applies to the practice of business law and perhaps particularly in the area of securities law.
The fact of the matter is that most individuals are more dependent on the success of their investments than ever before. Most of us are not Warren Buffet, however, so we have to put our trust in stockbrokers, investment companies and financial advisors.