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But someone who regularly bets on sports doesn't really care about the sport. What counts much more is how well you know the sport and how well you can assess situations and teams (injuries, lineups, previous games, ...). It really doesn't matter who plays the sport and whether they are men or women.
For someone who occasionally bets on his favorite team, you're absolutely right. There you bet of course only very limited in the domain of your favorite club, but usually also with a lot of hope that is placed in "your" team ... this leads in turn to the fact that you often miss out on profits just because you hope that your favorite team A beats the much stronger team B ... which often simply won't happen.