Providing an alternative payment method at a discount is not the answer here, obviously players will choose the cheaper option.
If Epic wants more money, maybe they should negotiate a smaller cut.
Then they should charge the developer for install costs + profit, not charge for all transactions happening in the game that have nothing to do with Apple and impose no cost on them. That's retarded.
It's like a landlord taking 30% of sales from the local florist rather than just charging rent. Totally messed up.
But for those who come with capital ready, it can be a horrible deal. Being made to accept that option when you don't need it means you end up wasting much more money than you otherwise would.
Same happens in the app store, in its absence of an option between these methods.
You are currently watching them attempt to do that, after previous, less extreme, attempts have failed.
They do the same on Android.