More leads can help when too few suitable enquiries are reaching the clinic and it has capacity to answer and serve more. If response capacity or lead quality slips as volume rises, extra leads make each new client more expensive.
A useful diagnostic follows one group of enquiries, for example those from a single month, forward over a stated period: booked consultations, attended consultations, treatments, and return visits where the treatment plan calls for one. Record response time alongside, rather than as a stage, along with the reason each enquiry stopped where it did. Then compare suitability, response time, appointment availability and booking rate by source. The largest drop is a prompt to investigate, not an instruction to spend. Before acting, set the bookings that drop could plausibly recover against their contribution, the spare capacity available and the cost of the fix. The same discipline of reading the data in sequence runs through this four-step diagnostic for marketing spend.