I agree that this market simply doesn't exist, and never will. The site and technology looks nice however. You should use what you've wrote, plus your skills, and quickly transition this application into a drop in designer replacement for some existing, popular application who's designer sucks. Believe me, there are plenty of candidates; they may be buried behind firewalls, or in niche industries, but they exist. I k…
If you design web apps, for example, you can (or will) benefit from jMockups because it makes it easy to design and get feedback on your app before you write a single line of code. And once you can link the mockups together (todo list), you could essentially prototype an entire app and get feedback on it with only a few hours of work. How's that for a minimum viable product?