Still small potatoes profit-wise, but if the share of actual revenue is that significant, than this is definitely a nice little trend for Apple. To be clear, I think the iTunes and the App store are more of an advantage/differentiator over Samsung in terms of potential (especially in the context of Apple's willingness to make bold steps in new directions). I think I came off as a little too glowing when I described Apple's digital offerings above.
I'm no financial expert at any stretch, however the following occurs to me. My iTunes bill comes at the end of the month. Presumably developers and content producers are paid monthly at a minimum. So Apple must have same very loaded bank accounts by the months end. I have read/heard discussion around how (at a vastly greater scale) Amazon have a similar situation. It might be a relatively low profit area, but it must give a massive fund?