एक campaign: CAC $3.4 - 23× सस्ता paid social। दूसरी: $200 burn, zero sales, 20 min ban - CAC infinite। अंतर: आधे costs गिने नहीं। पूर्ण CAC - economics।
Reactivation lead ~₹700 vs paid search ~₹10,500 - warm base only - reactivation, cold vs warm।
CAC = (SIM + warm-up + software + base + prep) ÷ dialogs ÷ sale
Delivery Rate 30–40% cheap proxy - dead list।
WABA sessions $0.04–0.08। Gray CAC heuristic $4–16। Warm-up cost - antispam। Payback 300–500 msgs - ban।
Fail: no warm-up → infinite CAC। Win: $3.4 vs $80 ads - A/B।
3–7× cheaper = expert opinion, not Meta benchmark। Cold new ≈ paid search - migration।
Last campaign full CAC recalc with warm-up + ban losses।
व्यावहारिक नियम:
WhatsApp default cheap नहीं - सभी cost lines honest formula में।
