I have a Photodeck website for selling RM licensing and prints. It does pretty well.
Is it worth the time and effort? Depends. Do you have, or can you create, something unique that's not already overdone on stock sites? Are you good with SEO or are willing to learn it? Are you good with promoting through social media or are willing to learn? Are you prepared to invest a lot of time? If yes, then it would probably be worth your time.