Agencies are accountable for deliverables. In-house CMOs are accountable for revenue—but take 6–12 months to ramp. Fractional CMOs (strategy + execution) are accountable for revenue from day one. This article breaks down accountability across each model, including sales-marketing alignment, vendor consolidation, and board-level reporting. Learn why agencies fail at alignment, why in-house CMOs take time, and why fractional CMOs can diagnose and fix broken marketing systems in 30 days. Includes comparison tables and real-world examples of accountability failures.