Regarding sports betting, I understand that you can apply skills and knowledge to help increase the chances of winning, but yes as you said that sometimes it is still difficult to get a win, but I think that's normal because no matter what and where you are involved in the name of betting is always about winning and losing, meaning that skills and knowledge in sports betting are only useful to help increase the odds but do not mean that you have certainty to win, in the end it still refers to how lucky you are at the time of running the session.
Good point and without any luck even how deep the research or how good your understanding about the game there's still a big chance that you may lose your bets there's no assurance and accurate prediction, underdogs can upset the heavy favorites depending in each situation and if how players will play the game, that same concepts is also use by those heavy gamer who risk huge amount of money placing their bets to something that unsual,
they are willing to embrace that big risk to earn big in return, though there are different types of a characteristics and acceptance when we discuss about gambling and more on self-explanatory in terms of strategy and how you set up your plan when playing.
I will say that actually in any type of betting the possibility of losing can never be avoided, no matter where you bet whether it is in the type of gambling that is pure luck such as slot machines, dice or in the type of sports betting which is as we know that skill and knowledge are quite helpful in terms of bringing us closer to the chances of winning, but the certainty and logic is that if only in the type of sports betting there is a certainty of winning then wouldn't most people prefer to bet rather than work? Sure, and they might even go as far as to borrow large sums of money from services to bet knowing that sports betting can always give us a win.
But the fact of the matter is that betting is still betting, the possibility of risk is more often involved than the chance of winning, because the concept of betting is that you bet your money on two possibilities at the end of the session between winning or losing and something that has not happened yet can never know the result unless you have completed the session. As you said, sometimes the favorite team can be beaten by an average team and that means the outcome of the bet will depend on how the match goes and in a match there is always something unexpected that happens, so it means that luck is still very important in any gambling activity because this is the only thing that will confirm your victory.