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You are right my friend, to earn such an amount as a referral reward is not so common, and to be sincere, without evidence, I find it hard or difficult to believe that he actually earned an amount that big as a referral commission.
I have a particular crypto exchange where
I have more than 80 users I referred to the exchange, and to be sincere, total amount I've received from the exchange as a referral commission is not up to $10 for about 9 or 10 months now, I know crypto exchange are different from gambling casinos, and if my assumption is correct, people are supposed to make more money from crypto exchanges since very many use exchanges to trade, but not very many do gambling, so like I said before, he's claim of making $27,000 in three months as referral commission on a gambling casino is hard to believe with any evidence.
That's a lot of users you've referred. And although getting around $10 per month isn't that bad, you certainly can hope for more. I hope one of your refs goes big one day and you'll get some good get some good commissions.
As for the claim of making $27000 within 3 months from refs, I hope @bhanu31 will provide us with some evidence in the future. It is hard to believe without any evidence, like you said, but it's understandable if he doesn't want to do it, imo.