Also, I think an important distinction might be: "if you don't already donate to calibre via one of the other provided methods, would this be a method you WOULD consider using to contribute?" I don't think anyone's operating under the assumptions that this would be something traditional donators might want to switch to in large numbers (though it could be a small factor). It's so that users who can't contribute funds directly (through the already provided channels) might be able to help support calibre in some way.
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