CRO compounds what you already pay for traffic
Every visitor is already bought and paid for, so lifting the conversion rate is the cheapest growth in the funnel. Take a page converting at 3%: moving it to 6% doesn't add a little — it doubles your leads from the exact same spend, which is identical to cutting your cost per lead in half. And unlike a bid increase, the gain is permanent. That's why we'd rather fix the page than buy more clicks through it: a tested, optimized landing page makes every other dollar in the account work harder, on Google and Meta alike.