A budget move is only as smart as the metric it follows. If the metric is vanity lead volume, the team can confidently shift money toward channels that make reporting look good while making the business worse. Budget decisions need a signal closer to booked customers and real revenue.
Lead volume is still useful, but it is too early in the funnel to carry budget decisions by itself. A channel can generate lots of low-intent traffic and still hurt the business if those leads fail downstream.
Budget moves need a stronger truth source than that.
The stronger signals are booked customers, booked revenue, cost per booked customer, and downstream quality measures like repeat behavior or contribution margin.
That is also why cost per lead and cost per booked customer should almost always be read together.
A good budget move is specific: what source loses budget, what source gains budget, over what time window, and what expected outcome should justify continuing.
The metric behind the move should be close enough to business value that the team can tell fairly quickly whether the shift deserves to stay in place.