Rich men gambling on investment opportunities plays a big role in moving forward important technology, including technologies and medicines in the health sector, which will indirectly affect the lives of millions in a positive way.
Like @fairlotto stated, gambling isn't inherently bad. Furthermore, greed isn't all bad, as pointed out in the example that I provided. Selfish actions can sometimes lead to benefits for the many.
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When did I ever say it was?
I'm simply arguing against your assertion that "gambling is never good." Speculating on early tech is just as much gambling, if not more, as playing blackjack at a casino, and, like it or not, we owe a lot to these big risk takers.
There lies a paradox in selfishness in that the most selfish acts can sometimes be great for everyone. It may be an exception to the rule, but it still exists.
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I agree with everything you said. I still don't agree with, to directly quote you:
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Lotto hanyalah permainan keberuntungan.