You walk into a casino, and you play roulette.
You bet
$10 on black,
lose
$30 on black
lose
$90 on black
lose
eventually
black comes out and you win.
I think the only thing stopping you would be the table limits?
Almost actually, No one can predict how much will the strake will be so that you can earn as long as you are not greedy or you know when to stop. If you keep playing, of course you will lose.