Although it's true that some people's dreams are more realistic than others, that doesn't make the act of dreaming itself any less powerful.
And besides, it's also true that some dreams only seem impossible until they're actually a reality. And while it can certainly be discouraging to see our big hopes not pan out, it's even more satisfying to watch as everyone who said you'd never make it is proven wrong.
And while the ideas we're about to go over hasn't catapulted anybody into superstardom yet, there's something special about the fact that we can see them in action at all.