It looks to me like she has written a number of books in this same "Darkyn" series over the past few years, several of which have peaked on the NYT bestseller list. Check her Amazon or B&N page.
Anyway, I agree that quality literature may, in reality, sell far fewer copies (although I'm sure that Pynchon has sold hundreds of thousands or millions) -- the reason I mentioned that was because one reasonable argument is this idea of fairness, where you could say, "it's not fair that someone producing something of this quality should be paid so little, so the system should be different." I would agree with that if Joyce Carol Oates was making $50,000 a year, but I think that in this case the market's valuation of this work matches or exceeds my personal sense of fairness.
I think it's better to take into account a book's longevity. If it is a classic in print 50 years and sells steadily, it could outsell a book in the NYT bestseller list, which might only sell that big for a year or even less.
'The Very Hungry Caterpillar,' a popular children's book has sold 29 million copies, and according to Newsweek, does $50 million in licensing deals a year. (yes, year)
Anyway, I agree that quality literature may, in reality, sell far fewer copies (although I'm sure that Pynchon has sold hundreds of thousands or millions) -- the reason I mentioned that was because one reasonable argument is this idea of fairness, where you could say, "it's not fair that someone producing something of this quality should be paid so little, so the system should be different." I would agree with that if Joyce Carol Oates was making $50,000 a year, but I think that in this case the market's valuation of this work matches or exceeds my personal sense of fairness.