What do you mean that we will lose 30% from only the first sale? If a user subscribes using IAP, their subsequent payments will also be charged a 30% fee by App

What do you mean that we will lose 30% from only the first sale? If a user subscribes using IAP, their subsequent payments will also be charged a 30% fee by Apple. Won't they? And its not the question of whether we can do business at $x * 70% or not. We would love to give 30% to someone who actually brings a customer to us (we actually have a 20% recurring commission for our affiliates). The question is how is Apple entitled to that cut?