How about creating an optional rules of "gamble for few hours and not more than 5% of monthly salary per week" with * " if there is an interesting event it is allowed to bet not more than 5% of salary", "withdraw if balance is increased 1.5 times". This might help to prevent excessive gambling, spending to much on it, it wont become boring, it might stop greed and wish to continue playing. Imo having and following own rules in gambling is a key from getting less troubles with it.