Healthy ROAS depends on margin: 70%-margin SaaS can survive 1.5× ROAS; 30%-margin retail needs 3.5×+. Most D2C targets 3:1 minimum.
ROAS degrades as you scale spend. Diminishing returns on every channel. Recovery agents effectively boost ROAS without spending more on ads, by closing the carts that ads already paid to create.
Voice-recovery ROAS often runs 10–30× because the upstream ad spend already happened. Every recovered cart is incremental revenue at near-zero marginal cost.