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.
Who cares if the amount of money involved can afford to lose or not for a person who receives financial support from others?
They won't bother to think about that anymore and they will just gamble no matter what.
The difference is about the pressure to win, gamblers who have financial support won't be pressured much to lose since they are expecting money without the need to work for it. Unlike those who do have stable jobs, they will be careful not to lose since they always need to work to maintain their income source.