It's all fun until large amount of money is involved in it. You see people talk about fun in gambling but on the other end, they are using large amount of money to wager, risking too much they can afford to lose. Yesterday, someone paste his whole account to stake Portugal against Spain and gave Portugal win including extra time or penalty and it work for him, you should see what he won but at what cost, risking all you have just because you want to make fortune.
You can imagine how it's going to be later if such person had other game tomorrow and then he thinks that doing such risk again is going to work and in the end it never works, he is not just going to be broke, he is going to feel the wrath of brokeness and make gambling a scam thing mean while you are the one that gamble all your wealth away when you can simply just put what you can afford to lose, gamblers need to do better when it comes to risk.
What do you mean by large money? I think large money are different from person to person. For example, some people can think 500$ is a large money that a lot of people can't afford to lose/waste. On the other hand, there are a lot of people who can afford even the loss reaching 50000$ or even more. So the large amount should be a figure.