This may not be up to Amazon. The publisher presumably sets the price of the ebook, and they aren't likely to lower it just because Amazon decides to have a sale. Also, a big pile of unsold books serves as a physical sharp incentive to a publisher or distributor to sell at a knockdown price to clear inventory. No such incentive exists for the ebook (indeed, if anything they might want to *discourage* people from buying the ebook instead of the pbook!)
Pbooks more than ebooks is a bit weird, yes, and certainly shouldn't be the norm, but I don't think it's unreasonable for exceptions to occur.
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