maybe so far many online sports gambling bets are doing 'reliable' skills and games, like Sportsbook and other sites, maybe we haven't been so lucky, like those who won some money.

Basically with many players in the world of sports gambling, especially soccer who compete and bet to win 50% of the bets they place, this is a challenge for sports gambling bettors, having to properly master every round of the game to the end, in order to win like them.
It must be competitive in order to be like them.