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by
Mary
(new)
Oct 14, 2015 07:29AM

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Mostly (for relatively new series) it's the simple fact that each successive book has been on sale for a year less than the previous one.
The correlation between sales & ratings appears irrespective of book number & so that doesn't support the idea that people are more keen on rating book 1s.
Though many series that aren't particularly well received have a 90% drop off between book 1 and 2.