https://www.theguardian.com/books/booksblog/2020/jul/20/an-author-bought-his-own-book-to-get-higher-on-bestseller-lists-is-that-fair

Author Mark Dawson has attracted criticism after bulk buying his own book gave him a high chart position. But that isn’t breaking any rules

For any author, being able to describe yourself as a bona fide bestseller is key to conferring your career with a certain gravitas – and will often bring you even more sales. In the UK, while most book charts are tallied by Nielsen BookScan, the Sunday Times bestseller list – like the New York Times chart in the US – has become the gold standard. But making the bestseller list isn’t necessarily as straightforward as tallying sales. Not all is fair in romance and war (and other genres) when it comes to getting to the top of the charts.

Take the case of Mark Dawson, a British writer who just over a week ago hit No 8 on the Sunday Times hardback list with his thriller The Cleaner, released by the independent publisher Welbeck at the end of June. This is a great achievement for any author or small publishing house, but Dawson had done something remarkable: he bought 400 copies of his own book, at a cost of £3,600, to push his sales high enough to make the top 10.