I also donated this month to both AdBlock and Calibre. Got messages from both. In the case of AdBlock, the author says he'll reply (if it's over some amount, which I apparently was.) For Calibre, I had included in the donation a request for a U.I. tweak; Kovad responded that it would be in the next version.
But I don't donate for the acknowledgement. It's sort of a pay-after rather than the pay-before we do with shrinkwrap SKUs like Quicken, MS Office, etc.
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