I think that if you will send your referral link to everyone - you can`t reach some nice profit if you haven`t some resource(website with reviews for example) with lots of new visitors. I don`t think that the big gamblers often register with such links. But if you have friends, that wants to gamble but don`t know how to start - it is possible way to get several $ for advices.
There must be a strategy on this one and it's not just all about sending your referral link to everybody but making such story that will enticed your target referrals. But of course, be truthful to what you're going to write or make.
Those big gamblers don't want to be under by someone like a referral because they don't want others to make money out of their deposits and money.
But if you've got one and it's an active gambler then you're in luck on having one.
As i said, i`m not serious referrer so it`s possible that i mistake. I know several ways to increase the referrals but the most part of them is good for various bloggers, reviewers, etc. I`m not some of them and i don`t like to spam hidden referral link, so i have only referrals that can ask any question and get fair answer from me. And they thanks me in such a way.
I understand what you're saying and that's really one of the ways to gain those good referrals. Especially if you're a good writer and the blog that you've written is helpful to them and you've attached the referral link onto that article or blog that you've written.
And as you gain them, you're also building a network and making a community out of them, that's a good idea and if you're consistent with that then congratulations to you.