If we only bet on the favorite team or fighter, we don't need to become a gambler because we don't need to care who's playing and how the sport's work. I can create my own thread and list all of my predictions where I predict the favorited team or fighter will win. I believe I will get around 70-80% of correct predictions, but if we calculate the amount I bet and the return I get, it's either small profit or big lose
But a gambler who gambles based on their selection of favourite team or fighter would make a bad gambling. You need to check the form, the emotion and conditions of your favourite before you employ them in your betting slip.
Technical, I high level risk bet without research can be regarded as a waste.