Nobody can say why people don't stop playing casino even when they lose. People know that they lose money even they know that they do not have money at all because they have lost all they money but they continue to play casino. They take credits and do not return the credis but they continue to play casino.
Casion is magic. People continue to play casino. That is why casino so popular and theire are so many casionos.
Not all people cannot stop playing at the casino and lose all their money. Many people can control their expenses and view casinos as a form of entertainment. But there are people who spend all their money in casinos and these are sick people.