"where losing $2 at volume is fine."
Sorry, when is this fine?
A dev flogs an app at 10 and pays 3 to Apple. Then on a refund they lose 3 and the end user has no incentive to even delete the app. Nope, I won't entertain that nonsense.
The only way that I can see for that model to play out is for the dev to factor in a lossrate x 1.3 uplift for their app. That means owners of shiny iStuff are paying Apple an additional unannounced "tax" based on their app churn. Use and discard more apps, then you pay more for the privilege. A dev would have to become a loss adjuster as well: "Hmm assume a 10% return rate" - so the upcharge on my app will have to be:
* My app should cost 10, assuming a fair market.
* I lose 3 on a refund, which happens on 1/10 sales (I was paid 10 on sale, I paid 3 to Apple, I refunded 10 and hence lost 3)
So my price adjustment would be 10 + (0.1 x 3) = 10.30. Yes, it looks like a simple uplift will deal with this. Sales: x, churn rate: c, Apple tax: a. => s' = s + (c.a)
That is anti-competitive behaviour on a gigantic scale. Apple are making the apps that are developed for their platform automatically more expensive by a process that looks suspiciously like stealing.
I call that parasitic.