The admission is not the win
Almost every institute is organised around enrolment. Counsellors are targeted on admissions, marketing is measured on enquiries, and the whole machine goes quiet the day a student joins. Meanwhile the students already inside the building are making a decision every week about whether to keep coming, and nobody owns that decision as a number.
A student who leaves mid-term costs more than an enquiry that never converts, because you have already spent the acquisition money and the seat is now empty for the rest of the year. Retention in education is mostly about noticing early and calling a parent while the reason is still a scheduling problem rather than a decision.