Retention

A key principle of relationship market is the retention of customers through varying means and practices to ensure repeated trade from preexisting customers by satisfying requirements above those of competing companies through a mutually beneficial relationship This technique is now used as a means of counterbalancing new customers and opportunities with current and existing customers as a means of maximizing profit and counteracting the "leaky bucket theory of business" in which new customers gained in older direct marketing oriented businesses were at the expense of or coincided with the loss of older customers. This process of "churning" is less economically viable than retaining all or the majority of customers using both direct and relationship management as lead generation via new customers requires more investment.

Many companies in competing markets will redirect or allocate large amounts of resources or attention towards customer retention as in markets with increasing competition it may cost 5 times more to attract new customers than it would to retain current customers, as direct or "offensive" marketing requires much more extensive resources to cause defection from competitors. However, it is suggested that because of the extensive classic marketing theories center on means of attracting customers and creating transactions rather than maintaining them, the majority usage of direct marketing used in the past is now gradually being used more alongside relationship marketing as it's importance becomes more recognizable..

It is claimed by Reichheld and Sasser that a 5% improvement in customer retention can cause an increase in profitability of between 25 and 85 percent (in terms of net present value) depending on the industry. However Carrol, P. and Reichheld, F. dispute these calculations, claiming they result from faulty cross-sectional analysis.