Jeff his sales have plummeted since the scandal broke. Before that his book was often number one in the JW category and it was hovering around 10,000 sales rank overall on .com and .co.uk. That implies a few sales on each site a day, multiplied by 5 years (2017 to 2022). That’s without even considering the hype and bump in sales at the beginning and preorders and so on.
Take a look at the number of reviews his book has got. You have sold 1,397 books (that’s pretty good by the way) can I ask how many reviews your books have got on Amazon? The point is that only a tiny percentage of buyers bother to leave a review on Amazon as you must know. LE’s book has nearly 600 reviews on Amazon. Do the math. The only ex-JW books that beat that (as far as I know) are Crisis of Conscience with over 800 reviews and Leaving the Witness by Amber Scorah with 900 reviews.
A very rough estimate of 20,000 copies sold is reasonable. It might be more; I’d be surprised if it was much fewer.