Comment This is not about app purchases... (Score 5, Interesting) 724
As a small developer, I would love if Apple took a smaller percentage of app purchases (which as others have pointed out isn't really 30% when you factor in referral fees, retail markups on iTunes gift cards and the credit card processing fees they pay out), but it's great that by enforcing rules they are effectively taking a step toward leveling the playing field for the small guys. (Instead of giving sweetheart deals to fellow big guys.)
But in this case, we're not talking about app purchases-- we're talking about transactions that occur in an app, and this has always been a questionable rule. It a straight tax on transactions. It's in the same vein as Verizon demanding Google pay them because Verizon customers are accessing Google "through their pipes."
And it's more inconsistent than people realize... I routinely place orders for food in the Delivery.com and the SeamlessWeb apps and because I have no credit card on file with either, I enter my credit card info for payment instead of using an iTunes account. So no 30% goes to Apple for my burrito, but DropBox leaves a link to their website in their SDK and suddenly all hell breaks loose. But Apple has a DropBox competitor and doesn't currently offer burritos I guess...