Amazon's bitch. Apple's bitch. What's the difference?
It's cheaper being Amazon's bitch with more tricks.
Really? It seems like the only way to get media onto your Kindle is through Amazon directly, or having an Amazon Prime subscription. At least with my iPhone / iPod / iPad I can use varying sources of media, provided of course that I use them in the iTunes or iBooks applications.
Amazon very deliberately kept the price on the Kindle Fire low. And that's because they knew that they'd rope people in with that low cost of purchasing the hardware, but make some more serious money on the media. It was a very calculated move on their part.