As much as we want to restrict our conversation to gambling, it's good to point out that anything that's related to addiction has a lot to do with being idle and not having what you're doing to keep yourself really busy. An idle mind Births a lot of possibilities and that's the root cause of gambling addiction. It makes you vaulnaurable and pushes you to go against your set out gambling rules be your an adult, a teenager, a male or a female.
I agree with you that people that can easily get addicted to gambling are those people who are handicapped financially because they are the major loss chasers, they believe that they can be very wealthy through gambling as such missing priorities failing to understand that in gambling, losing is part of the game, once you lose, you accept it and continue if you want to, not having in mind that you will surely get your lost funds, people that understand gambling never get stucked on the way.
I want you to understand that someone can be very busy and stil gamble aggressively, currently you must not go to live casinos or bet shops to gamble, anyone can gamble at the convenience of their hoem or anywhere they are, so no matter how busy people are, they can gamble uncontrollably, it all depends on individual mindset and the nature of their job too.
Though idleness is also a factor in real sense but as I said earlier it depends on individual mindset, there are people that are iddle but still do things normal, gambling addiction is caused by greed and inability of someone to controls his or her urge of wanting to arrive at impossible point.