True, there are times that prediction may win but in terms of constant win inside gambling that's really something that we can say not usual, there's no guarantee even the odd is really good or even you pick small percentage of losing if luck is not with you that kind of bet will still or can still be lost, sports betting group may exist and will continue to provide services both free and paid predictions but one thing is for sure, with gambling, there are no such kind of sure bet, everything still have it's respective risk once you place your bet/money inside.
At some point I wanted to conclude that, gambling have it own lucky day and time, this is because in gambling have discovered that some days I will have consistent winning at a certain time, while if I continue the same patterns the following day, iay experience significant loses no matter how hard I try to speculate the games correctly.
So it is very possible that while it become more obvious that in gambling there can never be continues winning, but then we all have our lucky days which we must have in mind and follow up with the whole process accurately so as to stay ahead even if not all the time.
Luck is always a factor and yes, you still need to understand the game and you need to continue learning how to analyze well and how to manage your bankroll. I see your point, and it's really happening with gamblers who think that they already have the knowledge, but eventually they still lose the bet. Either the player or the team they think have an edge will not perform well.
It's all about how you decide your judgments and like on the first statement, it's also with the luck that you have during the time you place your pick.