Here's a great little DnD-inspired video with a message.
Finally, the passage of time shown in their long beards and heroic bearing, they come to the end of the trail. A huge X in an empty room, and they don't get it, where's the treasure?! Then they see it: a mirrored wall showing...their own reflections! The journey was what was important, was what transformed them into the men they are now.
I think this video is a good metaphor for the player's experience in RPGs. The point isn't the amassed imaginary treasure or experience. The point is the journey: getting to spend a few short hours trekking across lush fantasy worlds or exploring lost planetoids or escaping dank caves full of misshapen terrors.