Humans are social creatures. We assess each other in terms of our status within the hierarchy of society.
Examples: Teacher/Student, Parent/Child, Police/Citizen, Cashier/Customer, etc.
We're pre-disposed to desiring to gain status. Content can either make the reader feel a gain in status, a potential gain in status, or allow the main character to gain status, causing us to relate with that feeling
Supporting Evidence:
Mazur, A. (2015). A Biosocial Model of Status in Face-To-Face Groups. In: Zeigler-Hill, V., Welling, L., Shackelford, T. (eds) Evolutionary Perspectives on Social Psychology. Evolutionary Psychology. Springer, Cham. https://doi.org/10.1007/978-3-319-12697-5_24