I don't understand the legal ownership fuss of their decision. If they had decided to take 5% instead of 30% there would be no discussion here. The only difference between 5% and 30% appears to be whether or not it's a good business decision. It does alienate a number of applications that have less than 30% margin, but that appears to be Apple's motivation. I would not go so far to say this should be expected, but it's a risk you take when you play with a company that likes to own such a large portion of the experience.