I know that for a fact and that's why if I chase my losses, it's not about the amount of my losses but the record that sometimes I can't take it a day having no win even for once.
Luck is a major factor in gambling even in sports betting wherein knowledge is an edge. Many gamblers spend their money to bet in sports but only few are fortunate to win a decent amount. Anticipating to become rich is understandable, but keep in mind that even rich people can also lose their wealth in gambling if they're not wise.
In sports betting, the high rollers are like one-time, big-time people. If they have bet for a game and then it's with a huge wager, if they win that's it for them. But if they lose, they'll find some other ways of recovering it until they get it back. In most times, they don't get it back and that's the truth for all of us, only very few gets to the top.