Ecommerce brands love to argue about ROAS. Is 3x good? Is 2.5x on Meta actually profitable once you factor in COGS? Everyone has an opinion and a dashboard open. But ask the same team "is your analytics stack worth what you're paying for it" and you'll get a shrug. Ecommerce analytics ROI, how to calculate it, and why almost nobody bothers, is what this post is about.