The US is huge and it doesn't take that many books sold to get on the bestseller list. Something like 5-10,000 to get on the NYT bestseller list. For amazon, it's less than 5000 upon release. In a country of over 200 million adults, that's peanuts. And Americans in general don't read many books lol.

If people do buy it it will be for the drama I expect.

Edit: the best selling book this year, Verity, has sold 3 million copies. Which sounds like a lot until you remember the 200 million adults in the country. Only 1.5% of the country bought it, less depending on how many of those sales were international. There is no real "cultural zeitgeist" in the US for books anymore.