Marketing ROI is the most lied-about metric in modern business. Most agencies and 'growth hackers' obsess over ROAS (Return on Ad Spend).

ROAS is a vanity metric because it ignores your product costs, shipping, merchant fees, and overhead. If you have a 4.0 ROAS but your product margin is 20%, you are technically losing money on every 'successful' ad click. You must optimize for POAS (Profit on Ad Spend).

Marketing ROI is the most lied-about metric in modern business. Most agencies and 'growth hackers' obsess over ROAS (Return on Ad Spend).

Ad spend scaling is not linear. As you increase your budget, the 'low hanging fruit' (high-intent buyers) is exhausted.

You begin reaching 'cold' audiences that cost more to convert and stay for less time. A campaign that is profitable at $1k/day might be a disaster at $10k/day. Scaling requires constant creative refreshment and CRO (Conversion Rate Optimization) to combat this efficiency decay.