Basically what I'm saying is, there is no reason for the developer to try to help a specific storefront, the developer does not work for the storefront, the developers that release games on Epic are just as much a customer of the store as, well, the customer.
If Epic has a shit storefront, the correct answer isn't to give it a lower price there to "Help Epic grow", the correct answer is "Well we'll just focus on selling it on GOG, Humble Bundle, and Steam"
It is unrealistic to expect or even ask for a developer to give Epic special treatment without proper cause "Just to be nice", not how the business world works.
We see this all the time offline, or rather, we don't see it... At no point did Nintendo, Sega, or anyone go "Oh no Toys R Us and KMart are facing tough times, we should lower our prices for those stores to help em out."
Now if it was a developer with actual stake in Epic, maybe they'd do that.. but I don't see Sweeney handing out large amounts of Epic stock to anyone do you?