Inside the Buyer Black Box: How the Buy Side of Programmatic Evaluates Supply Paths

Publishers spend considerable time optimizing their auctions, managing SSP relationships, and improving yield. But what happens to their inventory once it reaches the buy side? Who decides which requests get considered, which supply paths receive spend, and which publishers get blocked entirely? In this episode of Web Without Walls, Vijay Kumar sits down with Eric Tilbury, Head of Programmatic at Inuvo, to explore how programmatic buying actually works from the other side of the auction. Eric brings a hands-on perspective from managing campaigns, evaluating supply quality, and making decisions about where advertising budgets go. He explains why some publishers never make it past a buyer's filters, how reseller relationships affect trust, and what makes a private marketplace (PMP) worth paying more for. The conversation also examines the growing role of curation and sell-side decisioning, the limitations of conventional DSP workflows, and why optimizing for platform metrics doesn't always translate into better business outcomes. They discuss: What happens after a publisher sends a bid request: How buyers evaluate inventory, configure campaigns, and decide where advertising spend goes. How publisher blocklists actually work: Why suspicious traffic, invalid impressions, or poor supply quality can get a publisher excluded, sometimes permanently. Why supply path optimization matters: How buyers use ads.txt, sellers.json, and authorized direct relationships to identify trusted inventory sources. The hidden consequences of reselling: Why even authorized reseller paths can raise questions about transparency, signal integrity, and trust. How buyers manage QPS: Why controlling which bid requests reach a bidder can be just as important as optimizing campaigns after they launch. What makes a PMP valuable: Why buyers need a clear reason to purchase inventory through a private deal instead of the open exchange, whether that's exclusivity, scale, or a better advertising environment. Why excessively high floor prices can cost publishers demand: How buyers evaluate CPMs against expected performance and decide when an impression is too expensive. The difference between curation and sell-side decisioning: Why selecting better inventory and applying real-time decisioning models are distinct approaches, even when both operate through deal IDs. Why curation is gaining momentum: How agencies and buyers are looking beyond conventional DSP workflows to improve inventory selection and campaign performance. How contextual targeting is evolving: Why full URL transparency and page-level concepts can help buyers identify relevant audiences without relying on user identifiers. Why CTV buying follows different rules: Eric's preference for handpicked publisher relationships and PMP-based transactions in connected TV. The limitations of platform-reported performance: Why CTR, ROAS, and other in-platform metrics don't always reflect incremental business results. What buyers actually want from publishers: Clearer PMP value propositions, realistic pricing, and trustworthy supply paths that deliver measurable outcomes. For publisher revenue leaders, programmatic teams, ad operations professionals, and anyone navigating the open web, this episode offers a rare look at the decisions taking place beyond the publisher's auction. Understanding how buyers filter, evaluate, and prioritize supply can help publishers make better decisions about their own inventory, partnerships, and monetization strategies. Guest: Eric Tilbury, Head of Programmatic, Inuvo Host: Vijay Kumar, Founder & CEO, Mile 🎙️ Web Without Walls is a podcast exploring the ideas, technology, and people shaping the future of publisher monetization and the open web. Subscribe for more conversations on programmatic advertising, supply path optimization, publisher revenue, AI, and the future of digital media. #AdTech #ProgrammaticAdvertising #SupplyPathOptimization #PublisherMonetization #Inuvo #AdOperations #Curation #DigitalAdvertising #OpenWeb #WebWithoutWalls