I think it really depends on one's psyche! I don't bet much because I know I will never get rich with it but at least I try to study and collect data to win as much as I can, and so far it works. 30$ per week is what I bet: sometimes I lose them all sometimes I double or triple them. Luck plays the best part, you know.
Yup! It really depend on people if they will turn out to be addicted to it or not self control is needed when playing gambling if it turn out that your mind isn't strong enough to fight the urge you will end up addicted to it.