Critics from art house kind of skew the data because the audience of art house movies may be little in numbers but they are more engaged and would probably buy

Critics from art house kind of skew the data because the audience of art house movies may be little in numbers but they are more engaged and would probably buy more press, read more stuff about cinema, etc so there is more paper made for them. Meanwhile, the audience that watch more mainstream movies will be less engaged with the cinema's literature. They would probably be happy with just an ad or a trailer. Because they have different expectations about what is a movie. That is why there is less incentive to write critics for that audience. Hence the disparity in the data.