You may be interested to hear about a new avenue for self-publishing, this time for comics and graphic novels.
A company called comiXology invite people to submit their work for consideration - probably so the company can maintain good standards of art work and scripts. Their FAQs state the submission process is free, and accepted works are paid 50% of the net profit on each sale, once a $100 threshold has been reached, (which is similar to Amazon's threshold). Authors/creators retain their copyrights, so they can sell their work elsewhere also.
Considering that, in the past, selling self-published comics and graphic novels tended to be limited to friends, comic expos (if you could afford a table!) or a bit of shelf space in a willing local shop, then comiXology sounds like a great opportunity for those whose art folios are already bursting at the seams with largely unseen work.