You can even use VST plugins if you really want to (though I wouldn't, too many are rubbish).
If you feel like trying to run your VSTs under WINE (audio plugins are tempermental enough in plenty of native hosts). And really, you think you'll be getting better results with LADSPA? Show me a non-trivial LADSPA effect (like, say, a guitar amp simulator) that doesn't sound like trash.
"You can have this free beer as long as you don't drink it."
That doesn't count as "free as in beer" in my book.
Maybe this analogy is failing. All I was trying to point out is that you're perfectly welcome to use their SDK and write iPhone apps, test them in the free simulator, etc, without paying a dime. The $99 fee lets you test on a real device and/or deploy to the store. I can see being annoyed at not being able to deploy to your own phone (that's one of the things I'd most like for them to change) without paying, but access to the store? That's fair game, as far as I'm concerned. They've gone to the trouble of creating this ecosystem, setting up all the infrastructure necessary for you to deploy your app to potentially hundreds of thousands of users, and handle all the financial transactions. All you have to do is write it, and of course, pay them $100.
Perhaps brick and mortar comparisons are just as useless, but if I make some gadget, I don't see why any store on the block would be obligated to accept it as merchandise and put it on their shelves. Apple charging me for access to their system simply means that all I have to do is invent and build the gadget. They even take care of the packaging. Seems like a pretty fair deal to me.
Remember to say hello to your bank teller.