(1) if you want to make money on android tablets, you have to go where the tablets are. That is Amazon's appstore. They are, by volume, already 3-4 times the rest of the android tablet market. And this gap will probably continue to row. I would be surprised if, by this time next year, they do not have 10-15 times the marketshare of any other android tablet. Remember every other android tablet manufacturer has to make money on the tablet. Amazon probably loses money in order to make it back when you buy books, movies, magazines, music, etc, from them. Thus their tablet will almost certainly be cheaper, and hence more common, than any other android tablet.
(2) this will bootstrap their presence on android phones, especially once they release their rumored android phone. Which will be shitty but really really cheap (my prediction).
[1] http://mobilechannels.eu/index.php?option=com_content&vi...
[2] http://news.cnet.com/8301-13924_3-57327907-64/amazon-kindle-...