yes and that is the reason that we think about sports gambling where we can use our previous experience, study and analysis. In sports gambling it is important that we must have good knowledge about the team and their players performance, their weak and strong points.
I think this has been said numerous times and people do it meticulously as well. Those who look at the big sharks and think sitting in the sidelines that they are getting lucky, it also their hard work on analysis of the game. Although luck is also important in sport betting. Because if you are having bad day your best bets might even become losses. Which match is fixed and which is not is also something not told everybody. Even the tipsters dont know it - they make calculated guesses.
But those guess are backed by their analysis data.
To some extent you are right with the analysis part in sports betting, but most especially in soccer, there are some few times analysis has failed me which makes me just believe that it is still a game of luck anyway.
Every future outcome is always going to be unpredictable and even if you end up right, you should just consider yourself lucky. I see those analyses as just some guidelines to at least be on what you think could be the right track, but outcomes of a game can change for so many reasons.