I'm sorry, you're right. $20k is not a lot of money, but I did overlook the fact that most of the ideas are just that—ideas, versus an actual built business which seems to be in the minority. (Hey, at least it's better than Shark Tank.)
I stand corrected, though it wasn't the main point.
But yeah, you are right. it's not about the money. It would probably make economic sense for me to give 6% of my company to pg, even without getting any cash, just for the marketing effects.