Have you ever placed a bet by just doing random guesses on the outcome of the game?
Yes I did it before when I was a newbie. I just want to try my luck, so i'm just guessing who would win. I blindly placed my bet and I condition myself that i'm ready to lose it. But you know, it's not a good idea even you're prepared for the worse. Because why placing bet if you don't have idea on the sports that you're going to bet in? If you can gain knowledge to maximize your chance to win? It's true that luck is a major factor in gambling however in sports you can somehow use your knowledge to choose the right team.
Gambling involves luck and certain level of expertise to maximize chances of winning, I know of a person who is extremely good when it comes to sport betting, it takes him quite some time to pick up the games and accumulate their odds including teams he has no knowledge about yet he still receives a good compensation from his betting. Both luck and how much known has influence on one's chances of winning, so instead of depending on one alone which may not be efficient, try compiling both as it is much suitable to profit from.