OP, that’s what you can’t take away from gambling. Whenever there is a game you want to bet on and you are not sure of what to come of it, it is better you stay away from those games and bet on those that have higher probability of winning. The analysis done before placing a bet on a game is just what is needed of you and when you’re done with it and still feel some little sceptical about those games, it is better you let go off them. Analyze your game, place some amounts you can afford to lose on them and wait for your game to play out either in your favour or not as it’ll eventually count on luck after that.
If there are games gamblers are so sure of it playing them the possibilities of winning all the time would have been there however since no gamblers can predict exactly which game that is going to play the issue of doubting some games to me is not really that much important because at times there are games we will do reject but they end up playing.Althought I won't want to underestimate the importance of analysing games before playing them but too much analysis is not good because you may end up leaving the right games and going for the wrong since with your analysis such games won't play.