I have not done it yet and was just trying to and it seems like you can only transfer between users on ekata. I sent a support ticket and will follow through.

On Bittrex, I have noticed Grantcoin being traded on the exchange so there is a market for it. I haven't checked the other exchanges yet, but all this sounds like a good idea for a post, so I'll wait until hear from support and see what they have to say first, then I'll do a thorough post on it.