To interrogate what causes popular things to be popular is to focus on the responses to art offered by regular people with no expertise at all, which is to be, by definition, common.
Your favorite tumblog became a book and the excitement Linda Holmes is shaking with should be a lesson to us all: Slaughterhouse 90210 by Maris Kreizman stands as a cultural landmark that tells us to throw our “guilty pleasures” aside because Bojack Horseman and Clarice Lispector are perfectly compatible.