"To Buy or Not to Buy Leads" discusses the financial implications and long-term sustainability of real estate agents purchasing sales leads versus cultivating leads organically. Natalie Carpenter highlights that while paid leads can initiate a career, they often result in significant commission loss over time due to high referral fees. She argues that owning relationships and nurturing a personal sphere of influence leads to more consistent and predictable income, as these connections can generate repeat and referral business without additional cost. The text ultimately advocates for agents to gain control of their business and income by focusing on organic lead generation, offering coaching and strategies to achieve this balance.