The overall growth of the gambling industry totals to around ~$440 billion last 2018. If you were to take into account just online gambling, it'd come close to around ~$50 billion. That's already pretty huge, considering the time that online gambling has been around, and the dominance of physical casinos in the past. It's also expected for gambling to grow to close to ~$550 billion in the year 2022.
That number will grow from time to time, and no one will imagine how big the gambling industry will grow. When young people become adult people and they attract to gambling games, that will make the number will increase so big. That is why the gambling industry can still survive, whether it's offline gambling or online gambling because the number of people who come to the gambling games will always increase.
One person can lose so much money because he doesn't use big money in just one day or one week, but he uses small money, and he uses another money to gamble. If we calculate how much bigger the money that we use, yes, we can be amazed because that money can be used for buying something. And $10 million in a casino is not big, but for one person, that can be a big number. Gambling industry is a big industry which accumulating big money that has been used by the gamblers, and that number still growing every month.
And that's why gambling is scary. Let's say that you enter the casino every day, but you limit your spendings to $5. It may seem small, but with time, that amount would only grow bigger and bigger. A week, and you would've spent $35, a month, and its $140. a year and its what, ~$1700?
Spending $5 but every day that means a lot of money in a month. Yes, you have the right calculation. No wonder that many people regret when they see how much money they use in a year. It's not a big deal for them if they don't calculate or don't think about the money they will spend, but still, that is big money for some people.