Wait...Apple did invent something with their products...the necessity of accessories to provide features everyone else includes!
A new type of mac video->VGA connector for every laptop they release.
Leaving out a <$5 part so that you have to spend $20+ to get FM radio on your mp3 player.
A $30 cord to get USB on your iPad.
More than anything else they've done - they've created an entire secondary line of accessories for their products that take up way to much wall-space at stores!
Oh - and they also killed hardware choice (though this provides greater stability for an OS that only has to deal with 15 hardware configs instead of 20000) and refined vendor lock-in better than any computer company before them!