OP, it is a priority to understand that you are going to lose most of the time, it is a mathematical question, the key is to keep your funds as close to breakeven, so that when the variance goes in your favor, you would manage those profits.
The mistake is that many players, like the case you mention, want to turn those 2,000 into 10,000 in a couple of bets or a couple of hours. The player who understands losses as game strategies knows that if he loses 2000, he must have the effect of losing a "$1," e.g., If not, he is betting out of the bankroll.
Many players without betting are already losing because they do not have the slightest idea of financial management, or how to manage a bet size correctly per game, per odds, bankroll, etc.
The gambling was the unpredictable one,even we play the gambling with the tactics.But we don’t know when our tactics will bring us the money.If we get the money from the gambling tactics means,it was the good one.But if the gamblers loss the money,he should take the responsibility of the money involved.But the mostly of the gamblers start to scold the gambling site after the loss in their gambling games.The gamblers including my friend want to multiple 2k to 3x or 5x of the betting money.So the multiple the winning doesn’t affect the gamblers.But if my friend had loss of the loan money would leads to huge credit burden to him.
The same as when I win. Keep playing the same, what matters are the long term results, not having won or lost a single day. What does happen is that after many negative sessions in a row, what is known as a bad streak can affect you psychologically and you can start to make worse decisions because of it. If so it is better to play less and study the game more.
The gambler make this blunder,it doesn’t mean he is experienced or the beginning gambler.After make the big unexpected result from the game,the gambler will create the fake trust on him.Like he had huge potential to make the big winning from the gambling site.But we don’t know what the exact result after the big winning in the gambling site.If everyone can make the big money from the gambling site,why not all the big shots multiple their money in the gambling sites.The gamblers based on the luck.The gambler who loss should accept the loss, the revenge gambling leads to the loss.