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.
I can afford to lose it if the money was given to me is for gambling but if it's not It's money that I cannot afford to lose and I must not use it to gamble, people give you money to spend on important things like food and paying bills, if they found out that you've used it to gamble it will hurt their feelings so its better not to gamble if the money is given for something else.
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.
If the money you're using is just excess money then there's no issue at all, and about your last sentence, gambling is not a cash cow if you lose your job never depend on gambling, it's high risk.
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.
Not because you have a job that you're going to gamble all your salary or even a big part of your salary, after you pay all your bills and shop for groceries and there's excess money then you can use that to gamble, gambling should be your last priority when it comes to allocation.