"ideas are worth so little" .. that's a very broad and dangerous statement for you to make given that people might want to tell you things in confidence.
Obviously, if you have IP, dont apply at YC because they don't think it's worth anything.
An idea is "self-driving cars." IP is how to make it happen. I'd venture to say that it's tough to communicate all of IP during a short application process.
Obviously, if you have IP, dont apply at YC because they don't think it's worth anything.