I wonder if any developers have bumped up rates for in app purchases (+30%) while still giving the option to buy on the website w/o the premium. Not sure if this would violate any rules, but this would seem to offer customers a choice, while exposing Apple's cut for convenience.
It is against apple's terms. And honestly, it's pretty ridiculous IMO. I don't see how they can both force you to use them for in app purchases, and then dictate that you must pay 30% for anything purchased through the app. Thank god apple didn't create the first web browser or every website that sold products would have to pay apple to do so.