I think the poll could be better, bracketed, and not "less than 30%". It needs to be more specific. 5% is still less than 30% so we are still determining if the members here are sarcastic or just playing with it. You should change it to 5-10% of income or something like that. It's better and more precise when those are the choices.
I can never think of using 30% unless that's your disposable amount, and that's your choice. I hope people who regularly do this can manage their money wisely.
I don't believe that a sensible and responsible person who has a job and earns a living will spend 30% of their income only on gambling because that would definitely not fit in their budget if they have a family and has to provide for them unless it is someone who is single, lives alone, don't have many expenses and earns a lot of money, that is when one might be able to spend 30% of their total income into gambling without having any effects on their personal life.
An addicted gambler might do that since they wouldn't think of other stuff much and gambling comes first for them, but an addicted gambler would never be so much responsible to have a job an earn a proper income, and those who earn a living already would barely get addicted to gambling.
I've seen countless responsible people, great earners, who enjoy a game of chance. You make it sound like spending on gambling is equivalent to throwing money into a fire. Sure, 30% might seem like a high number, but who are you to decide what's sensible for someone else? Not every individual has the same financial obligations or priorities
You draw this line between addicted gamblers and responsible earners, but that's just black and white thinking. You'd be surprised how many high-functioning individuals enjoy a gamble and still fulfill their responsibilities. Your attempt to fit everyone into these neat little boxes is incredibly shortsighted. Life is more complex than your simplistic categories
what @dezoel is saying is that for a person who only has a single form of income per month which is his salary still has to pay bills like water, electricity, food, children's school that person cannot afford to take 30% of your salary to play in a casino, and this is not just about the casino, a responsible person who lives only on a monthly salary and has bills to pay will not take 30% of his salary to consume alcoholic beverages, having fun out there and then harming the whole family. the most that people who have a single source of monthly income and have a family can do is to take less than 5% of their salary for fun and in that part of fun it would be including gambling and other things like going somewhere
now the scenario changes when it comes to rich people and who have a lot of business, for these rich people they can afford to play every day because for these people the money they lose in a section of a casino, the next day these people they will earn more money from their many trades and recover lost money. for example let's imagine that a rich man has in one of his many bank accounts $2,900,000 so he takes $500,000 and plays in a casino all day and loses all the money. the next day in one of the many trades he makes a profit of 1,000,000$ and puts it in his account that had 2,900,000$ and with that his account will have 3,400,000$
see that even though he lost $500,000 in a casino in just one day, he recovered the next day. so when people ask things like what percentage someone should allocate to play, it becomes a very difficult question to answer because there are many differences in income between people, and also because we all know that in games there is no guaranteed profit, so put money that is can afford to lose