I think that people are generally really terrible at being ambassadors of their own work.
Emily GouldTo some extent the shorter the writing assignment is, the harder it is to accomplish, and a blurb is 200 words max. Blurbs are meaningless, and actual people who are buying the books don't care about them at all.
Emily GouldA lot of people get to the point in their careers where blurbs are ghostwritten for them, because they're like, "I want to support this person, it's good for my career," and so they get someone at the publishing house to do it, or they copy something from the press release. People write their own blurbs, absolutely, some huge percentage of the time.
Emily Gould