Personally, I’ve seen many HTML5 games around here. The thing is, if it’s an unique game it will get some sales but not too many, I’ve usually seen games get around 20-30 sales. The only games that seem to go well are popular games (solitaire, poker, mario clones) or games that are trending at the moment (at their times: flappy bird, apple-pen, etc…).
I wouldn’t personally sell games here, even though I thought about it. One good thing now is that you can set your own price and you might make more money if buyers get extended licenses.