Summer camps are the cash cows for hagwons.
Mostly because parents need something for their kids to do, preferably functional, and a day can take a long time. Parents might pay a lower hourly fee, but as I said before, capacity is expensive, and if you can fill it, that is when profit starts kicking in.
The problem is, since schools stopped serving Saturdays, they reduced the number of weeks during the Summer holidays, in effect reducing the possibility to have camps for longer. Therefore, your potential profit for the whole year just took a nosedive. Thank you government. I have tried extending into Saturday, but in effect, it just increased my capacity cost, increased advertising cost with very little revenue to show for.