The more I think about this proposal, the more I believe that gambling or such personal things must be taught by parents. Here are some reasons:
1) Not everyone wants to learn to gamble, likes it or interested in it. So why would my kid learn that at school?
2) School is a place where students get general average information. Teachers are not the one who should teach each and everything. When kid graduates from school, he must have average knowledge on basic things. Gambling isnt basics in life
3) Parents ask to much from teachers. According to them, teacher must be a nanny, friend, teacher, team mate and dedicate whole life to kids. Teachers have their own lives too.