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I personally try many times even give ads with my referral link but my luck never works because I check I never have any referral even never click on my ad its really strange or I am really unlucky in this case because few months back I was also very active for this all but after have nothing then I drop my this idea and never try for this all.
What advertising network are you using? if you are using mellowads, dont expect too much from it. From my own personal experiences, At best if you are advertising it for a month then you might be able to get an average of 1 or 2 new referall every 5 days or so. These referalls might stay active for a while or they will leave after their first claim but it wont stay for that long
Best way to get a decent referall is to refer an actual gambler that might have an interest gambling on this site instead of hoping your random referalls stays active