I'm not missing any point. I simply think you're 100% wrong. Apple is working to perfect the design and that prompts the shrinking and simplification of connectors.
The iTunes store is still a relatively small percentage of Apple's revenue. Can you imagine how small their connector revenue is?
the itunes store is a hook to the ecosystem, it drives hardware sales, in that sense, it does not need to make a huge profit, but it still does MAKE A PROFIT.
Any profit is good profit and any profit is better than making no profit? The amount of profit, no matter how small still has a positive impact on the books. Companies are not in the business of giving stuff away for free.
While the design change may have been done for design or utilitiy reasons mainly, the fact they they are profiting from the sale of the adapters was part of the decision. If you think they decided to just make and sell the adapter as a last moment decision at cost, and that they didn't discuss the revenue stream and profit of the adapter during the design change, then you have no idea how businesses work. They disucss the financial impact of EVERYTHING and EVERYTHING is done with profit in mind.
Same can be said for the new iPad and iPhone connector. People think Apple just changed it for design, but look at the iPad 4, the old connector space is just empty space. Then look at how Apple is tightly controlling the devices and cables made for the new connects...ie LICENSING it to companies who want to use it...that means PROFIT. Small profit at first, but small, incremental and regular profit streams all created under the guise of design improvements.