When will game developers sue SONY Playstation and MS XBOX for having to pay to sell games on these platforms?
If game developers manage to destroy the appstore, the last secure platform will be destroyed.
So the rate that Sony and Microsoft charge are actually much less than the purported 30%. Both companies use progressive pricing (the rate increases the more units you sell). Only the highest grossing labels get to the 30% bracket. Most developers only see a 5-10% or maybe 15% cut.
If Apple were to lower their rate to this price, it would still be high compared to the US average for supply chains (roughly 3%) -- but it would at least be more competitive than what it is now.