~snip~
$100 is not a big amount when it comes to gambling. So earning $100 a day from gambling is not a problem and losing a million dollars in 1 day is not impossible. So gambling income depends on how much luck you have and how much gambling experience you have. No one can guarantee you that you can make regular $100 income from gambling but it is possible. However, it is important to know that you can also lose all your money if you gamble.
If you manage to win $100 a day, simply do the same thing you did, but increase your bets. You'll be a millionaire soon.
The thing is that the math behind gambling tells you that the odds of winning (any amount) consistently, is low, and it get much lower the longer you've been winning.
As a simple example, say the probability of winning X amount any day is 0.1, which is really high compared to the real world.
The probability of winning the first day is 0.1, the second consecutive day is 0.1*0.1 = 0.01, the third is 0.001, and so on.
As you see, the longer you continue with your winning strike, the lower the odds to actually accumulate one more day, even though the odds of a single day winning remain always at 0.1.