Comment by kmeisthax

The best case is 15% for subscription apps after the first year of service, or if you're a "small business" developer under a certain sales threshold. The latter goes away after you reach a certain size, after which you pay 30%; the former requires you to adopt a subscription business model.

I still think calling it a "30% cut" is accurate, even though there are discounts now. 30% is the base rate. You mentioned Steam, which also has discounts too, except they're the opposite ones of Apple. The cut starts at 30% and goes down the more sales you make. This "costs game developers more" only in the sense that it would be incredibly difficult to qualify for both Apple and Steam discounts at the same time. But the base rate is the same.