Yes, but you can't say that you made money before the sum of the dividends and the reselling price is superior to the buying price. If you invest 100€, the probability to loose 100€ is small; but to loose some of these 100€ not so much. If you invest well, the probability to lose money at all may be small, but if you gamble intelligently on sports it is too.

It's the same equation: more risk=more potential profit, less risk=less potential profit. I fail to see the difference with gambling.