The Enduring Allure and Treacherous Traps of Celebrity Endorsements in Book Marketing

Updated Oct 2026: this editorial has been rewritten and now cites its sources.

A famous name can move a book a long way. The best-documented examples come from celebrity book clubs, where a single pick has turned midlist titles into bestsellers. The same evidence also reveals the limits of endorsement, and federal rules now set clear boundaries on how endorsements and reviews may be used. This editorial examines what the data show about celebrity endorsements in book marketing, and the risks that accompany them.

The Oprah effect, measured

One early economic analysis, which BYU described as the first on the subject, came from BYU economist Richard Butler and two student co-authors. As BYU News reported in 2004, Butler and his co-authors examined the 45 non-children's titles Oprah Winfrey picked from the club's launch in 1996 until 2002. Because individual sales figures were not public, the researchers relied on USA Today's weekly list of the top 150 titles.

The results were striking. Only 11 of the 45 books had previously appeared on the list, Butler said, and the highest rank any of those had reached was 25th. Of the first eleven books Winfrey picked, all went to the top four within the week she recommended them. Her more popular picks that were later released in paperback spent an average of 6.5 weeks in the top 25, even though they had already been bestsellers in hardback a year earlier.

Reese's Book Club and its successors

The model has carried on with newer clubs. NPR reported on Sep 3, 2019 that Reese Witherspoon's book club, launched officially in June 2017, had picked 26 books, and that according to NPD BookScan those titles sold almost 700% better than the average. Kristen McLean of BookScan told NPR that the first five picks of Jenna Bush Hager's "Read with Jenna" club had overperformed the fiction market by about 500%.

Vox reported the same year that none of Reese's Book Club's 28 picks to that point had sold fewer than 10,000 print copies, according to BookScan, while a debut by an unknown author can sell as few as 3,000 copies and still be doing okay. Vox described the case of Megan Miranda's The Last House Guest: in the week before Witherspoon announced it as her August pick, it sold 892 print copies; in the week after, it sold 5,494.

The best-known case is Delia Owens's debut Where the Crawdads Sing. Publishers Weekly reported that it surpassed one million print copies sold in 2019, a rare feat for an adult novel, and that popular wisdom credited much of its success to Reese's Book Club, which picked it in September 2018. PW added that strong word of mouth then carried the book further. Vox noted that its first print run had been 27,500 copies.

What the evidence does and does not show

These figures make a strong case that a trusted celebrity pick can multiply sales. They also carry caveats that matter for anyone hoping to apply the lesson.

First, the clubs select books their hosts believe in. NPR quoted Sarah Harden, then chief executive of Witherspoon's company Hello Sunshine, describing a focus on stories in which women "are not the side characters." That suggests the effect depends on a curator with a defined taste and a large, trusting audience.

Second, the PW account of Crawdads credits word of mouth as well as the club. An endorsement can start momentum, but the book itself has to sustain it.

Third, one study of athlete endorsements outside publishing found decreasing sales returns over time; whether that finding applies to books is untested. A study by Anita Elberse and Jeroen Verleun in the Journal of Advertising Research, summarized by Harvard Business School, found that athlete endorsements were associated with increasing sales, and that sales jumped with each major achievement by the athlete. It also found that the sales effects showed decreasing returns over time.

The legal boundaries

Endorsements and reviews are now subject to specific federal rules in the United States. The Federal Trade Commission's rule on consumer reviews and testimonials, effective 21 October 2024, prohibits selling or buying fake consumer reviews or testimonials, buying positive or negative reviews, and certain insiders creating reviews or testimonials without clearly disclosing their relationships. In support of the rule, the FTC discussed evidence that included a Better Business Bureau study of fake celebrity endorsements.

For book marketing, the rule draws a practical line. A genuine recommendation from a celebrity who has read a book counts as promotion. A fabricated endorsement, or a review written by someone with an undisclosed connection to the book, can break the law.

The reputational risk

Endorsements tie a book to a person, and that link can cut both ways. Vox observed that Crawdads kept selling even after an article connected Owens to a real-life killing that allegedly involved her husband and stepson, and commented that the Reese's Book Club brand appeared strong enough to withstand a scandal. The example shows resilience, but it also shows that endorser and author become part of each other's story.

Lessons for authors and publishers

The documented evidence supports a few grounded conclusions:

• Curated picks appear to rely on trust in the curator. The Oprah and Reese clubs built their audiences over years, though no cited study separates trust from fame.
• An endorsement starts momentum; it does not guarantee it. Word of mouth carried Crawdads further.
• Effects can fade elsewhere. The Elberse and Verleun study found decreasing returns for athlete endorsements; it did not test books.
• Disclosure is required. The FTC rule bars fake testimonials and undisclosed insider reviews.

The documented cases show that a trusted celebrity pick can multiply a book's sales. The evidence supports treating it as an amplifier for a book that can hold its readers, used honestly and within the rules.

For readers interested in the subject, Celebrity Leverage, by Jordan McAuley, on Amazon is available.

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