Support agent vs. AI shopping bot (Shopify store with 20K monthly sessions). Agent: 500 tickets × 10 min × $20/hour = $1,667/month. AI bot deflects 60%: $1.3K LLM + $200 infra + 200 tickets × 10 min × $20/hr = $2,167/month... but conversion lift 15% on 3% baseline = 0.45pp × 20K × $75 AOV = $6,750/month revenue uplift. Net: $6,250/month gain. Build cost: $35K. Payback: ~5.6 months. Cart-recovery bot (Klaviyo-style) alternative. Abandoned carts: 1,000/month at $120 AOV; baseline recovery 8% = $9,600. With AI proactive WhatsApp nudge: +5pp recovery = +$6,000/month. Build: $20K. Payback: ~3.3 months.