I have problem with that as well,i hope that customer will start to losing his money(he earned 3000 pounds on casino somehow)
Also i think rule of minimum 5 affiliates is backfire-i reffered one customer,and i was in nice plus.Beacuse of that rule i was need to promote more and i got new customer and look what happened-he earned 3000 pounds and question is will balance ever recover.So i wasted resources for promoting.