1) It's not even the point whether there is some cost or none. It's not the cost that prevents Apple from implementing open codecs. It's control, I already emphasized that above. They spend a lot on other things, it's not like they direly lack resources.
2) I didn't invent the usage of "open" as in "liberated". That's used in open Web, open technologies and etc. Usually some try to complain that free software is different from open source software and so on. While it's formally valid, most often you can deduce what's implied from the context. Open codecs imply liberated codecs. Open standard (in many contexts) includes being not encumbered by patents (surely, even closed codec can be implemented as open source, it doesn't make it free because of that). And that's not the case with proprietary codecs - they are patent encumbered. That's why they are not open standards. When something is discussed as open vs closed as in not having a public specification, it's usually pretty clear.
3) Vorbis is clearly innovative over MP3. We were talking about digital players, and most of them use MP3, not AAC.
Opus is clearly innovative over any above, including AAC.
4) I already explained, it's not about expenses. It's about control. It's not just about "taking actions that benefit other people". It's about taking the opposite - actions which damage others (i.e. HTML5 codecs mess). Apple can't escape being blamed for it.
5) Even if there is some benefit in limiting the number of codecs, it's not what drives Apple not to use open ones, especially when they are technically better.
So we agree that Apple doesn't see a benefit in using open codecs, but we disagree on their motivation or what exactly they see as a benefit. You view them equating benefit with reducing expenses. I think they consider control as the primary benefit.