This document discusses the value of a loyal customer (VLC) for several companies. It defines VLC as the total revenue or profit generated by a customer over their lifetime. The VLC is calculated using a formula that considers revenue per unit, contribution margin, repurchase frequency, and buyers' life cycle. Quantifying a customer's VLC allows a company to determine the total market value gained or lost by winning or losing customers. Examples are provided to show how VLC is calculated for Sam's Club, Costco, and other companies based on membership fees, retention rates, and average customer lifetimes.