It is indeed interesting to see that Android is an untapped market and growing everyday. The Android Smartphones are not really smart, but really good phones. However as a developer, I tried the Android store, even tried the Amazon store, but I did not like the way they worked, however here is an article I found that is articulated quite well, hope that can give you some insight.
http://shiftyjelly.wordpress.com/2011/08/02/amazon-app-store-rotten-to-the-core/
cheers,
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