I wint agree with you on this topic, since to me, referral programs are one of the best means of earning passive income. But it all depends on how the individual engages and the rate of their activities, we have many channels of refers operations and it all depends on your approach to things because that determines what you take from the program.
It all depends on the individuals method of engagement and the number of audience the individual has. Someone with relatively large number of audience which is gambling base will have no problem getting people to register through their link.
We need to note that some casinos also do not make the referral system so easy and simple.
Some adds alot of other activities to accomplish before you will be entitled to your reward.
Some also make their kyc and other personal requirements credentials demanding that some people will have to give up even after referring some number of people