This is not true if you have enough luck its not needed its all about the fact that you should have the luck.
Without luck even with high bets you do not get rich, you can also get rich with low bets..
You will be rich with low bets? its impossible unless if you are betting and buying lottery ticket that has millions of money jackpot prize.. but if you are just gamble in casino there is no chance to be rich.. with small amount..