I've been licensing my HTML5 games to publishers for the past 7 months, and have made over $20,000 doing so at time of writing.
My advice is to approach publishers directly and build your own list of contacts. When you use a service like MarketJS, you're competing with a lot of others for a small pool of publishers. There are a lot more out there.
While I don't really want to bring this up in my first few posts on this forum, I joined just to reply to you and I feel this is relevant: I'm currently writing a book called "Making Money With HTML5" which I believe would help you a lot.
The book is available for pre-order, but since it won't be finished for a couple of months yet soon I'm sending out a "quick guide" to all of my pre-order customers that will explain the vital information that they need to know. Included in this guide will be the details of a few publishers that I have access to.
If you do wish to pre-order the book you'll also receive this information. The link to my site is below:
It's not cheap, but it would be a wise investment.
I provide more detailed personalized support to my customers but I hope this post has helped you. Contact publishers directly - that's where the money is at.