You are reducing a whole industry that based on research could be evaporated by only such things as willpower? that's absurd. Not every psychological condition is merely caused by a lack of willpower. Also, Willpower would not be the sole solution to help those who are addicted. That is simply ignorant and unemphatic to believe such a thing.
Firstly, you need to read posts thoroughly since I never specifically stated that the entire psychology and therapy industry is depending only on the willpower factor. It's a major reason behind most mental conditions which helped their industry earn big.
Secondly, you clearly have no idea how important willpower is to gambling addicts which is your opinion is what's absurd. Do your research.