This is what makes gambling so confusing and difficult to become good at, as you could do the perfect bet and do a great prediction for a match, but no one can really predict what it may happen and suddenly you find yourself losing that bet even when you did everything as you were supposed to do, so someone that was relatively new to gambling will try to chance what they did, when in fact there is no reason to do anything about it.
That's what gambling entails in itself. It is populated by predictions especially when you engage in sports bets amongst other ones. You only gamble based on predictions then leave your hopes high at the mercy of the outcome of the games. This does not necessarily mean that one cannot become an expert in gambling, because of how long some people focus on gambling, they become more experienced and informed of the decisions they need to take to get the right results. Does this mean they will always be right? Absolutely no. They still depend heavily on their instinct and experience to detect who wins or loses a game.