Well that just depends what sports you know lot about. If it's boxing, it's definitely easier to bet on boxing then basketball or egaming if you don't know squat about those. Just betting on statistics depends on what statistics are you using about. If you talk about multipliers in casinos, you will eventually lose if you are trying to just make safe bets without knowing the reasons behind them.
How many people can really make their money with sports betting? If you follow the sport closely, you can find some value especially if it is like a smaller sport (no soccer or basketball or tennis). Don't just bet on statistics if you don't really follow the sport, I don't think, in the long end, that you will have a positive ROI. There are no safe bets, even betting on odds of 1.01 or 1.02 can still give you a loss!
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Definitely it's a very small minority group of people, it's still gambling after all but you would have an edge if you knew a lot about the sport and the athletes, teams and coaches on it.
And i am guessing that someone somewhere has already build a good algorithm for winning with all the data we can get these days. But those kind of algorithms are never going to get shared as they would stop being an edge immediately.
I don't even understand how people make money by day trading as that seems a lot like sports gambling to me. There are no safe bets on day trading either, only probabilities.