The transition of credit cards from simple payment tools to high-value reward vehicles is a calculated move driven by the economics of Customer Acquisition Cost (CAC). In the traditional banking era, a bank might acquire a customer through a local branch relationship or a low-interest mortgage. However, as the financial sector became increasingly digitized and competitive, banks realized that a premium travel or cash-back credit card is the most effective hook to bring a high-earning individual into their ecosystem. By offering a sign-up bonus worth $500 to $1,000, the bank is essentially paying a front-loaded marketing fee to win a customer who may eventually use their high-margin products, such as personal loans, mortgages, or investment services.
This strategy is frequently referred to as a “loss leader” model. Just as a grocery store might sell milk at a price below its cost to draw shoppers into the aisles, a bank offers a massive welcome bonus to achieve “top of wallet” status. The goal is to ensure that their card is the primary payment method the consumer reaches for every day. Once a card is saved in a digital wallet or linked to recurring utility bills, the inertia of human behavior often keeps it there for years. The bank’s long-term profitability calculation accounts for the fact that the initial cost of the points will be recouped through years of interchange fees and, for the average consumer, occasional interest charges.
A critical component of the bank’s mathematical model is known as “breakage.” Breakage refers to the percentage of points or miles that are earned by consumers but never actually redeemed. This occurs when points expire, accounts are closed with remaining balances, or users simply forget they have rewards available. Historically, loyalty programs have relied on high breakage rates to keep the liabilities on their balance sheets manageable. For a bank, a point only has a real-world cost when it is converted into a flight, a hotel stay, or a statement credit. If a user earns 50,000 points but never uses them, the bank has successfully incentivized the spending without ever having to pay out the reward.
Furthermore, banks profit from the non-churner majority. While a disciplined churner systematically extracts value without ever paying interest, the vast majority of cardholders eventually carry a balance. The high interest rates associated with rewards cards—often several percentage points higher than those of vanilla cards with no rewards—subsidize the benefits enjoyed by the savvy minority. This creates a cross-subsidization effect where the interest paid by one segment of the population funds the business class flights of another. Banks are comfortable with this disparity as long as the aggregate portfolio remains profitable across hundreds of thousands of accounts.
Ultimately, points are a proprietary currency that banks control to manage their own financial risk. Unlike cash, the value of a point can be adjusted by the bank at any time through devaluations, which occur when the number of points required for a specific reward increases. This ability to manipulate the value of the debt they owe to their customers makes points a much more attractive incentive for a bank than a flat cash payment. Understanding that points are a volatile currency is the first step in learning how to value them properly against a cold, hard cash floor.
In the next post, we will examine the different types of reward currencies, specifically comparing fixed-value cash back against the flexible, high-upside world of transferable points ecosystems.