E-books proliferate so rapidly on various sites that using different covers would be quickly enshrined for all eternity in Google cache and in sites that don't update their content. (I have found one of my books listed on a site selling steam cleaners. Go figure. That's another thread altogether.) I would find it confusing to see a different cover. That said, I have seen mainstream publishers use different covers, but it struck me as a gimmick.
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