The document discusses reasons why pay-per-click (PPC) marketing may fail, which are referred to as "non-marketing doom". It identifies two main categories of failure: failures in process, and failures in understanding. For failures in process, it provides examples like stock issues, pricing issues, and poor customer service. For failures in understanding, it discusses clients not understanding concepts like attribution and lifetime customer value. It emphasizes that marketers should communicate clearly with clients, educate them, and know when an issue falls outside of the marketer's scope of responsibilities.