Well I'm not exactly knocking Apple, like I said I own a few iPhones now, a Mac, iPod and a few other Apple goodies. I love how my iPhone just syncs right with iTunes (still hate iTunes but it's growing on me), plays so well with my Mac, my PowerBook (yea I'm little behind the times with my laptop). But...
It is kinda like that, you basically rent the iPhone cause you can't do anything to it unless you JB it and personally I hate Winterboard cause 2/3 of the themes don't ever fully work, paid or free. And I understand Apple's view on it, to keep it simple and keep it "working" it needs to remain as it was intended, designed and built. I get that... But it wouldn't kill them to let you theme the phone with Apple approved themes... or change some icons around or some colors...
Take the 4Chan app for example... you won't put that on your phone unless it's JB cause for some reason Apple won't allow it on the app store. Apple is the ruling super power of the iPhone and unless you jump ship with your iDevice in a plastic bag held by your teeth... they have the "end" control of YOUR experience.