Move beyond a singular focus on "source pipeline." Instead, measure marketing's holistic impact by asking three distinct questions: 1) Did buyers know us beforehand (Preference)? 2) Did we accelerate the deal (Influence)? and 3) Did we originate the demand (Sourced)?

By measuring success on 'last lead source,' the company was incentivized to pour money into paid search for product trials—a clear final touchpoint. This model blinded them to the higher value of other lead types and actively discouraged investment in demand creation activities that build brand and generate higher-quality leads.

Jon Miller realized his successful Marketo playbook failed at Demandbase because Marketo's powerful brand acted as a "tailwind," inflating program performance. This reveals that GTM success can be misattributed to tactics when brand is the true, unmeasured driver, creating a false positive for the playbook itself.

This powerful boardroom reframe argues that focusing on "marketing sourced pipeline" incentivizes paying for low-leverage demand capture. A strong brand, by contrast, generates high-intent, "pre-sold" buyers organically, accomplishing the same goal more effectively and for free.

Instead of chasing quantifiable but often misleading metrics like MQLs or pipeline attribution, focus on qualitative feedback from sales. Successful brand marketing means the sales team enters 'warm rooms' where customers are already familiar with and receptive to the company, eliminating the need to start from zero.

Jon Miller calls measuring marketing-sourced vs. sales-sourced pipeline a "terrible KPI." He argues it’s impossible to do accurately due to the complex buyer journey. More importantly, it actively undermines the collaboration required for GTM success by creating a culture of credit-taking instead of teamwork.

The 95/5 rule suggests most B2B buyers aren't actively buying. "Sourced pipeline" is a harvesting metric that only measures the 5% who are in-market. This myopic focus ignores marketing's more strategic role: building brand preference with the other 95% of future buyers.

Marketing's true function is probabilistic—it increases the chances of being in the consideration set when a buyer is ready. The common mistake is to measure it deterministically (e.g., this ad led to this sale), creating unrealistic expectations and flawed strategies.

Solely judging marketing by last-touch attribution creates a false reality. This narrow metric consistently favors predictable channels like search and email, discouraging investment in brand building and creative storytelling that influence buyers throughout their journey. It's a losing battle if it's the only basis for decision-making.