Then that brings us back to the point, that you're not offering the developers anything of value. We could easily put the game on our own server, with some ads and get all the ad money for ourselves.
The why not question can simply be answered with this..
"But why?"
Why would I? I may not have a reason not to, but I certainly do not have one to convince me.
On the other hand, I could bring my game onto Kongregate and Clay.io which both have a bunch of fun plugins to offer me, leaderboards, achievements etc. and they also have behaviors to help me export my game easily to their site.
It all comes down to being realistic.
If your site is going to expose my game to a small community, and has nothing to offer me in return except ad money.. I can do that very well on my own. But I want my game somewhere which has more exposure, something like Kongregate.
So I'll take my game to Kongregate, unless you have something more to offer.
Sorry for the harshness, its very nice that you're trying something here, and 17 is a very nice age to have such ventures.