Because just like what happened to someone last week on a betting shop, he saw a game that he believes is going to play and he was so confident that is going to win, so he put all his money on that single bet with the intention of wining big but little did he no that he was making a terrible mistake by putting all his money on a bet, so however at last he lose the bet and became very upset considering how he just lost all his money because of greed.
I think almost all gamblers often do that because they are too greedy to put all their money on a bet that they are sure will win, that's why I always hear the advice that because we love a team or a sports club we feel selfish and too self-confident so we ignore and underestimate our opponents too much. , that's why it's hard to guess when luck is not on our side.
As much as possible, never bet with all your money because it will only make gambling more wasteful, so it's better to bet with lots of sports bets so that it is possible to get other wins that can cover some of the losses in that match. To be honest, I'm not too interested now in betting with all my money. on one match because it doesn't give me more chances of winning and it's true what you say don't bet all your money on one match