They say if you build a better mousetrap, the world will beat a path to your door. But world will only do that if they know the moustrap exists.
Every time someone says, but if I put my script out, then somebody can steal the idea. Yeah ... it's a possibility ... but even if you have the world's greatest script, until people READ it, they won't come asking to buy it ... will they? So pop a few bucks to the WGA & to the copyright office in DC. Then GET IT OUT THERE or stop whining.