Paid ads often fail to scale efficiently in service marketplaces due to several factors. Firstly, increasing customer acquisition costs (CAC) can quickly diminish profitability as competition rises or the ideal audience pool becomes saturated. Secondly, the inherent variability in service quality among providers makes it difficult to consistently deliver satisfaction, leading to poor customer retention despite high ad spend. Furthermore, complex matching algorithms are crucial; if the marketplace struggles to connect users with the most suitable service provider, conversion rates and repeat business will suffer. Another key issue is limited or inconsistent supply of qualified service providers, meaning increased ad spend might generate demand that cannot be met. Ultimately, without a strong focus on lifetime customer value (LTV) and a seamless user experience, ad spend quickly becomes unsustainable.