This part is a bit odd:
http://www.amazon.com/gp/feature.htm...cId=1000476231
Quote:
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User revenue will be split 70% to the developer and 30% to Amazon net of delivery fees of $0.15 / MB. Remember that unlike smart phones, the Kindle user does not pay a monthly wireless fee or enter into an annual wireless contract. Kindle active content must be priced to cover the costs of downloads and on-going usage.
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Quote:
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Free – Active content applications that are smaller than 1MB and use less than 100KB/user/month of wireless data may be offered at no charge to customers. Amazon will pay the wireless costs associated with delivery and maintenance.
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So if you are doing an RSS/data dependent app, you should either make it a) free, and under 100KB/user/month, so you don't have to pay for data, or b) make sure to charge enough to cover those wireless fees. (so a .99 cent app might not make too much sense, if Amazon is taking 30% plus any wireless fees)