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There's another advantage to digital printing: You can use it for very short print runs, and so, if you want professional looking galleys to send to reviewers, you can print them digitally quickly and easily. Even if you don't print your entire book digitally, your galleys will look better and more professional if you print them digitally.
*Book printing is one of your most important expenses, and you don't want to send out anything to reviewers that might take away from the strength of your book itself.