Zaza's first published book sold a grand total of 400 copies. He was informed by his editor that books need to sell at least 1000 copies to get a bestseller rating.
Why was that enough sales to be considered a bestseller?
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You’d be surprised how few book sales it takes to get a bestseller rating. Graham Greene was able to quit his job at the Times on sales of 3000 copies of The Man Within (although that was a rather different time with lower living expenses relative to income—contemporary authors who sell 3000 copies won’t be quitting their day jobs). Lani Sarema got to the top of the New York Times bestseller list in 2017 by buying¹ 5000 copies of her book. I would imagine that in the context of Georgian book sales, 1000 copies would be a large number of sales.