It's not about the reward, it's about him fishing for Freebitco.in referrals.
He pays a small price in hopes you get hooked to the website and make him money
and it is a perfectly legitimate way to get to a referral. He will spend their own money on that and takes the risk, it may not pay off for him. I have seen many similar services where it is possible to buy referrals of different levels, nothing new.
I see no reason to attack AnoniX1 this much, he offers nothing illegal and seems to be a completely legitimate method of payment.