* Power imbalance: Teachers hold a position of authority over students. Gambling with them exploits this power imbalance and creates an unfair situation.
* Potential for exploitation: Students could be pressured into gambling even if they don't want to, or they might be at a disadvantage due to their age and experience.
* Violation of professional ethics: Most teaching codes of conduct explicitly prohibit such behavior. It undermines the trust and professional relationship between teacher and student.
* Legality: Depending on the type of gambling and the age of the students, it could be illegal.
In short, gambling with students is a serious breach of professional ethics and could have serious consequences for the teacher.