I was surprised that some author said that on the Dutch TV show "Lubach" earlier this year. He stated that the (absolute) number of copies sold to get in the top list of the Dutch market is about the same as the number of copies that gets you in a NYT list.
He explained this by saying "Americans don't read much" and you seem to imply the same. But it appears that in the US about 300,000 titles are published per year (2013 data) versus 16,000 in the Netherlands. So is this an apples-to-apples comparison ? (source https://en.m.wikipedia.org/wiki/Books_published_per_country_...)