You likely can't find any narrative writing because I don't publicize it. It's at stories.wegnerdesign.com . However, the same principles apply to my tech blog. I spend a lot of time on those posts, and I don't want anyone else to have rights to it.
As far as the worth of exclusive rights, I suppose it is personal opinion, but I still disagree. Especially when exclusive rights are so easy to come by.
Is it possible you're misunderstanding exclusive / non-exclusive rights? Non-exclusive is better for you. Terms that required exclusive rights would restrict you from "licensing" your content to someone else, or even publishing it on your own.