"Ben Lehman pointed it out to me a few years ago. Most people, in their roleplaying histories, have pursued one creative agenda, sometimes fulfilling it, sometimes not. When they encounter the idea of creative agendas, they look to find their diversity in their own roleplaying history, but it's not there! There's only one there. When they finally encounter the realities of another creative agenda, they react with active rejection: "but that's not fun. Really, really no. Why would anyone do that? Is that even roleplaying?"
[GNS is the theory of how other people roleplay.]"