What math can do is help in EV+ games to make predictions but in EV- games its a waste of time trying to develop strategies because every strategy will fail in the long term.
I guess a popular game like poker can be called as EV+ game, right?
I also believe that sports betting is considered an EV+ game as even though the fair odds would normally reduce your wining to 5-10% because of juice but you have the option to increase your odds by selling points.
I like sports but not so with poker and although it's an EV+ game but still I am not winning consistently, so how much more in EV- games?
Right but I guess the thing with poker and sport betting is that majority gamblers is not into it. They would rather go with games with much riskier or with EV- and really wanted to beat the odds. And they try to developed strategies they say work, but unfortunately, they forgot one thing, they didn't include that you need a lot of luck to be able to win with EV- games.