We already know that less privileged people are more prone to getting addicted to gambling with the involvement of financial reward. They are the ones chasing more wins because they actually need the money. The more money they get, the deeper they get into the addiction.
I do not completely agreed with you on this that only the less privilege are those prone to getting addicted to gambling, and if you must know we should also remember that not only the less privilege needs money or are eagerly wanting to change their lives, everyone is prone to it as long as they are not applying a safe gambling practice it's easier for anyone to be vulnerable to gambling addiction.
Now can we have a definition of addiction?
To me an addiction is someone constantly engaging him/herself into a particular activity or play without seizing. We can also say that addiction is when someone can not do away a particular habits, characters or becoming used to a particular thing in life were they faces difficulty and becomes a thread to their neighbors, household or relatives.
Now, let's also look at the
wikipedia result;
"Addiction is a neuropsychological disorder characterized by a persistent and intense urge to use a drug or engage in a behavior that produces natural reward, despite substantial harm and other negative consequences".
In all I did not see were only the less privilege will get addicted, as a matter of fact it not characterized to a specific groups of people or genders, addiction is addiction be it gambling or other things that leads to addictions.