Gambling is a place to spend money, although many gamblers consider casinos to be a place to earn money. But in reality, more gamblers lose their money at casinos or gambling sites. So I think all of us here probably have almost the same experience, namely losing a lot of money gambling
Sure. We seems to spend more money than to earn money in gambling. That's why we don't expect to be rich and gamble excessively. Most gamblers assume to gamble for fun only, they prioritize the get the entertainment. Earning money is a bonus, that depends on how lucky they play in gambling.
I also lost money because I lost on gambling, but maybe not that much. But I know there are people who spend a lot of money for gambling.
You must spend small money only for gambling, that's why you don't lose a huge money. Those people who lost huge money probably because they can't control their emotion, they gamble excessively with much money. If you don't want to lose a lot of money, you need to have a good self control.
In your opinion, what should we do if we have lost a lot of money on gambling? Do we keep gambling to win so we can cover up previous losses? or stop and work normally and leave gambling?
You may need to evaluate your approach/strategy on the gambling games. If you seem there is something wrong with your strategy, just change it with more effectively one. But if it is a luck-based games, you don't need to do anything. Just stop gambling temporarily to calm your mind, so you can gamble with a fresh mind then.
Make sure you don't try to chase the wins! Don't force gambling when you are not in a good condition. That only leads you to spend bigger money.