Earlier quoted context omitted.
If you honestly think PG rejected people based on their idea, I think you're wrong. That's probably the last criteria he used. So, work on the idea. I would reject 90% of submissions, too, if I was running something like this. For example, with Google, Google AdSense was the glue that made everything work (profitability, great product, many users, good reputation, ability to have free food.) You might say their demo…
yep vlad. As i told you, we know why we were rejected. so its not the idea
Of course, if you are trying to keep your idea secret, then this could be difficult to do.