Mostly gambling and betting related works goes on hype and lie because they want more peoples to involve with them which is never been easy just because of these things take changes like these, and they spread fake stories which make motivation to peoples.
Gamblers are had time with mostly never been lucky enough to stay on same level for long time they also lost in long run which hurt them badly even sometime they are having most loses then wins which bring more stress but still they needed to be stayed normal which give relief.
As mentioned mostly if someone have few big wins then casinos never accept his bets easily, but they needed to be stayed on their strategy and never go for jackpot which surely never been good deal for them.
Oh God, let's always remember that when someone becomes a gambler, they also become a liar.
Nobody likes to lose and above all nobody likes to be laughed at and pointed out as a loser.
So if there is no absolute certainty, it is often a matter of lies, like when someone goes fishing and invents big fish.