Perhaps it's not high concept enough? In that case, that's absolutely nothing to do with my writing. However good it is, if it's high concept they want - I'm just not ticking the right box.
I'd just like to extend that argument a bit further. You don't need to enter any competitions these days. You don't need your script and idea 'validated' by anyone if you don't want. Just get it out there. And get it made outside of the system.
Hope, Mr Vista, WaterMelon were all done this way.
The point is if you love it, if it ticks your box then you go for it!