Some have been good customers, while others have not been so good. In fact some customers have been downright bad, because acquiring such customers costs more than the lifetime profit they'll generate. There are many other ways to segment a market , such as geography, demographics, and lifestyle patterns. These indicators can frequently be correlated to buying patterns, but they don't actually explain why customers buy. For the reasons customers buy, you have to look at how your products create satisfaction by meeting the customers' needs.
Customers buy a particular product for many reasons.
Some are looking for certain features. Others rely on word of mouth to reduce the risk of making a bad decision. Still others base their purchase decisions on their overall perception of the company or product. These customers purchase products from a market leader to feel assured of having made a good decision. In this case the brand's market share may be just as important to the customer as the product's features.