Kindle Version VS. iBook version

[IndyMLVC]

I was wondering why Kindle versions with A/V material are of lower quality than iBook versions.
For example, the "making of" books for the Star Wars trilogy just came out on Kindle with video and audio. On the iBook, they're 720p (HD) and on the Kindle, it's 480p (SD quality). In fact, if you look at the file sizes, there's a MASSIVE difference.

Another example: the Life Magazine special on the Kennedy Assassination with A/V came out last month. On the Kindle, it's 35mb. The iBook is 305mb. This is unacceptable.

This makes me sway from the Kindle to wanting to buy an iPad. Kindle really needs to step it up. This is unfair to those of us who are devoted to buying a Kindle.