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There is a widely held belief that implementing fault management always costs less than handling faults in the field. However, the relationship between the costs of fault management and maintenance is more complex, and formal decision-making support is often lacking. This paper proposes quantitative methods to evaluate the economic sustainability of fault management solutions and the quality levels that support a product's business case. It introduces a mathematical model describing how investments in fault management reduce expected maintenance costs, and a second model linking the product's fault coverage to its return rate, which reflects both product reliability and potential impacts on brand reputation. Together, these models provide a framework to guide decisions on fault management investment and to quantify the trade-off between implementation cost, operational cost, and product quality.