I've seen similar arguments a lot lately. People are comparing ownership of the iPad to rent or lease type arrangements. Sorry, but you're the one who's just wrong on this.
Maybe if you spent $500 dollars for rights to use the theater while being told you could bring your own food in, then the rules changed it'd be comparable. Otherwise not even close.
You just don't get it. Apple owns the App Store. Apple therefore has the right to dictate the terms of the App Store, because they own it. Developers get to choose to use the app store and agree to Apple's terms if they want. End of story.
That analogy only works if the theatre was also owned by the moviegoer. A better analogy would be a DVD player that wouldn't play movies if you ate the wrong brand of popcorn while watching in your living room. If you're going to call someone out as "just wrong" by using an analogy, please make sure your analogy says what you want it to say first.