Any normal old school would simply focus on instructing their students to raise the institution’s reputation. A school for Monster Girls has some differences. You need money to make the school bigger and improve its reputation, and that’s done through engaging with the world’s oldest profession. If you don’t train your Monster Girls right, they could injure their clients.
If clients who are just coming for a little fun keep getting nasty injuries, it will damage the school’s reputation, and could even lead to the school’s closure.