Risk is a small amount or big amount is differs from person to person. Those who have 5k$ think a small amount or big is different from those people who have 5 Billion dollars. But the risk should be taken only those amounts which a person can afford to lose. And it depends on the person's affordable. A rich man may not afford the amount which a poor man may do. So, it can not be measured by rich man or poor man.
Affordability is very important in gambling and I believe this is the first warning to all gamblers, only that they do not often follow it. Well, the rich will always have more money in their possession and getting it ready to be wasted since they do not have much use for it, and at times, it will not even affect them since they have channels that are earning them money. For this reason alone, the poor can't behave in gambling the way the rich would, yet the number of gambles could vary. What I mean by the number of gambling is the number of times they wager, the poor may continue to wager his money consistently and uninterruptedly, but with a little money per betting. Whereas, if the rich are wagering too much per time, he might feel it when it gets to a certain level unless he is a fool, which is not a good characteristic.
We should not be wasting money anyhow, there are other purposes we can use money for even if we want to expel some of the money anyhow. This attitude should still even be reflected as responsible gambling in the rich people whether or not they have enough money for gambling. Above all, if this context is to be adhered to, I stick to the rich here as my choice, they have more money and resources, and even the environment of their gambling at times is so encouraging and entertaining compared to that of the poor. So they are the ones who are supposed to take more risks. Also, in my opinion, even if they are not consistent about it, they are still the ones who are taking the higher risk due to their worth.