Every good business person knows that there is no asset more valuable than information about your client's customers. Knowing their prospective customers, what they are looking for, and what is important to them makes all of the difference in making sales.
While many of these businesses minded individuals spend large amounts of their time involved in research - far too many forget what is probably the least expensive, easiest, and most reliable method of gathering this information. Your client's customers are the best source of information you could ever ask for. Who knows better what is important to the customers than their customers themselves?