Every team tracks latency and uptime. Almost nobody tracks "what does this actually cost per request / per page / per user?" In a world of cloud billing, the difference between a well-built and a poorly-built backend is frequently tens of thousands of dollars a year — and it compounds silently in the invoice, not in the incident log.

1. Build a "cost map" of your backend
2. The typical money-draining patterns in PHP apps
3. Real cost-reduction case studies
4. Making it a habit, not a project

A mental framework (attribute cost -> find the bleed -> fix with data) plus a checklist of patterns to audit in their own systems, so they leave able to find one real money-bleed within a week.