Well over a extended period of time the Average value of stocks increases, whereas in betting over time (assuming a "standard stock persona and standard better) the average return for the consumner is less than the average output
Average value of stocks increases, ummm, where in the world did you get that from?
And no, with betting if you are good, you will win, if you are bad, you will lose, it's more of a skill game, just like with stocks, it's skill + probability.
$100 is quite abit paulsterio, ethics aside i presume you are often successful?
Hmmm, well I don't bet it all in one go, I make ten $10 bets, of which I either break even or win. Well as of these two nights, I bet $100 and ended up with $102.50, so i.e. I won $2.50, which isn't good enough!
But yeah, pretty much, I win and break even far more often than I lose, in fact, I rarely lose, but I do spend a lot of time researching and following tennis.