L'auteur américain Damien G. Walter pose la question dans un article (en anglais) sur son blog.
Il est à lire ici
"But for urban fantasy or any mass market fiction to work, my reading pattern must not be typical. I’m hypothesising the existence of ‘habitual’ readers, people who plough through two or three or more books a week, and read within genres that they like and will buy one urban fantasy series after another and keep coming back for more. Hypothesising because, while I can imagine these readers, I can’t prove their existence other than by deduction. Large sections of every bookshop are packed with urban fantasy novels, ergo the urban fantasy reader must exist."