So basically, 200$ is a really low payment to give up most of your game's rights to a publisher. I highly recommend avoiding that, as it drags the market down for everyone.
A good, yet small html5 game can be sold for approximately 3000$ to 5000$ under exclusive terms on average. The html5 market is only on mobile browsers right now, so you have to build lightweight, simple to pick up, optimized games.
This great article on photonstorm will give you some still valid details on the market's current state : http://www.photonstorm.com/html5/the-reality-of-html5-game-development-and-making-money-from-it
I'll sum the market's state up by saying that it's hard to get started making money. You'll have to make good products and really stand out. You should go check Spil games's portals to see a bit the level of quality required to get deals.