Restricted Content Access
I've sold a few copies of the first publication of my essay on the film Persona on Amazon.com and also made the content available on a previous website.
It would be better if the content was restricted to registered users because:
1) It feels weird to sell copies of the essay while providing completely open access to it.
2) I fear some students are plagiarizing the work for assignments.
Restricting certain types of content to registered users also creates incentive for people to join the minguo community.