I'm guessing producers get pitches all day long every day for the "hot new reality show" so you're going to have to make it catch their eye and make them really want to listen to you in the first place.
I'd maybe talk to a patent attourney or something similar to see what you can do to prevent them from telling you no at first, and then using your idea later without any payment to you.
My only advice is to document as much as you can now, so that you can prove it was your idea first.
good luck with it
oh yeah, can I be on the show?
-Drew