A very important thing to keep in mind when creating a movie, is to see what will you gain profit from. Since film making is also a type of business, profit is important. No one will want to create a movie that they will end up paying more to create than what they receive back from it. The website bellow shows exaclty what are the top genres of movies in the U.S. by box office revenue. As it shows, thriller comes in at number 5, which compared to the number one, it seems really small but still it's considered top 5. This way movies won't need to be such a high standard but will eventually be easier to creat and still have a chance to receive good revenue. 

https://www.statista.com/statistics/188658/movie-genres-in-north-america-by-box-office-revenue-since-1995/