Effort needed to cobble together a plot out of some of Nasu's hanging lore threads and filling the gaps with riveting Senpai-tier dialogue vs the effort required to write a new setting, gee this is a stumper. And that's regarding the main plot and not the myriad quests/events/whatever you call them that are just month-long advertisements.
Never mind, I can live with safe-distance derision rather than to assign bad role models.