It wouldn't be like that for a gambler all the time unless he have spent his entire money in that casino. If I visit the casino with the intention to flip my $1k into 2k and I didn't archive my intention for going to the casino that day, I will be disappointed and could have a long face, but if I make up my mind to flip the money but also have in mind that I can as well lose the money, I wouldn't feel too bad. A gambler will feel so bad after they lost the money they didn't want to use for gambling.
This scenario is normal in gambling and majority of gamblers must have experienced this. Sometimes we start gambling with the intention of having fun but in the long run, we might hit a huge figure and sometimes the urge for gambling more keeps increasing, and when you fall for that and loss everything there is no way you'll leave with a smile on your face, even if you try faking it, there is always someone you cannot deceive, which is yourself. At least that amount would have helped in paying some bills, and grabbing some bottles or a sweet time with your family and friends. But there are also times where you decrease the amount you use in placing your bet for the purpose of increasing the gambling time and having fun.
Indeed and that experienced gives you the confidence to keep playing for more, though it's a case to case situations where some might get addicted and some might gain knowledge it's on the gambler itself if you they'll take that experience and use it for their advantage, but for those who turned things into addiction most of them will either call it a scam or will surely regret participating on any types of gambling activities that they've involved with.