Yes, I'm concerned for the reasons you mention - and because I have several devices already, which require different formats. That's why I only buy books I can de-DRM so I can convert them to what I need.
I don't plan to buy many books from Amazon. It woud depend on availability and price, i.e. if they are not available elsewhere or are cheaper at Amazon. I don't like the premium they charge international customers (it's more than tax), and that makes me even less likely to want to buy from them.
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