[erictoma]

Originally Posted by GoversAU

That's not true. I've bought mobi formatted books from other sites that work fine on my Kindles:

http://www.smashwords.com/

http://dreamspinnerpress.com/

are just two of them.

You did buy only non protected Mobi format and from amazon owned sites !
non protected books are really no protected books, thousands of titles are missing in those Amazon owned sites !

You cannot buy books from other stores.