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I have about 10 referrals that gamble constantly and you`re right - really big gamblers just 2 of them. But i even didn`t thought that they can bring me such money. Of course it is their choice,
but i hope that they wouldn`t stop gambling 
Being in your place, I would hope for that too.

I would also hope for them to stay rich as they are today so that they could afford to wager such big amounts.
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You don't need to be in Silicon Valley or need to have any of the things you have mentioned to promote your affiliate link in an effective way. None of the people I talked about have any of this.
As I said you need to know how and where to promote your ref link. Maybe you are targeting the wrong audience and this is why you didn't get the results you were expecting!
But you do need an audience. A big one, and also with many rich gamblers in it. The thing is that, if you are not an influencer, people will just ignore your posts. They won't be reading them, let alone registering via your links. That's what
I, but maybe there are places I don't know about, where everything is different?