When you are depending on someone for assistance because you want to gamble it means that you are risking what you can not afford to lose. Why because you don't have the money to gamble but someone have to give it to you before you can stake.
It is possible that even the money you get from others to gamble can still be the money you can afford to lose,because from your mind, your plan is to use it to gamble, but in case you don't have any money with you and you ask for assistance, there is something you can use the money for, but you use it to gamble. That type of money is what you cannot afford to lose. Know that there are many people who have money but sometimes decide to ask friends for some money they will use to gamble. So collecting money to gamble doesn't mean the person does not have money with him or her, but the truth is that he doesn't have what he can afford to lose sometimes.
But when you have jobs that pays you money so well and you are gambling it means you are risking what you can afford to lose. Why because ones you lose your job will give you another money.
However, many people would say even if you have jobs but you are staking higher it also means you are gambling with what you can not afford to lose. Moreover it's true and I have to dauth but I have a feeling that ones someone that have a good paying job is staking more than what he can afford to lose, there is no different between addiction there.
What I understand by the amount of money someone can afford to lose is that when someone loses it, it will not affect him or her. So even if someone has a job and always receives a huge amount of money monthly or weekly, once they gamble with any amount of money, if they lose it, it will affect him or her. That type of money is what they can't afford to lose. Just for example, if someone is receiving $1k every month, one day, when they receive their monthly salary of $1k that it already have planned for but decide to gamble with $200. This means it just sacrifice the $200 for gambling; this $200 is the money it can't afford to lose because if it lose the money, it will affect them because it already have plans for the money in other ways.