The class-size problemWhy do large classes cost less but often deliver less?
A large centre charges less because one teacher serves many students at once, but with 30 students in a room nobody checks each student's working. Errors that are never corrected repeat month after month, so a low fee can end up buying very little actual teaching contact.
The cost savings are real. The structural constraint is also real: the teacher cannot see where each student's method breaks or correct individual errors live. The fee is low; the cost of the uncorrected error compounds over time.
The value comparisonHow should parents compare a small group with a large centre?
Compare the format of participation and the teacher-to-student ratio, not the headline price. Six hours a month of active working-checking in a small class often produces more learning per ringgit than more hours of passive attendance in a hall, because correction is what changes a student's method.
A large centre at RM100 per month that provides 8 hours of class time, but where the student is passive throughout and no one checks working, may produce less learning per ringgit than a small class where every session includes method correction.