They are the ones who do really have that advantage when it comes to referral and afiiliate marketing on which they are the ones who would really be making money or profits on this space because of that having wider
audience which they could possibly be able to make them register under his/her link without any problems but in speaking about reliable income or source then it would really be still varying since not all would really be registering under your link even if they are your subscribers and also not all does have the money that they could really spend up for long time on doing gambling.This is why results and numbers would really be still not that the same or something that you could say that its not something that you could rely or depend on. Waste of time? Not really if you are really that good in marketing but if not then better not to make yourself
get engage with this stuff because its really that hard and not something that would really be worth of your time.