Well, there's also the issue of time.  I've got a full-time job, a circle of friends whom I try to make time for, a side career (well, at this point just a hobby) as a semi-professional actor, and about a dozen other interests and hobbies vying for my attention.  If I'm going to start carving chunks of my days out for a dedicated project, it either needs to be something I know will be profitable or enough of a passion-project that I don't care if it bombs.  And as much as I love reading comics and writing fanfiction, I really don't have a whole lot of inclination to sink that much time and effort into a medium whose audience has already shriveled to a fraction of what it used to be.