Google Ads Optimises for Revenue. Your Margins Have No Vote.
WooCommerce stores every product’s cost. Google Ads Smart Bidding has never seen that number. It optimises entirely for the conversion value you send — which means it systematically funnels budget toward high-revenue, low-margin products. WooCommerce’s own documentation admits COGS ‘does not integrate with WooCommerce Analytics.’ POAS is the fix — but it requires margin data at the event level, sent server-side at order time.