A rating system based on views, as well as user-based rankings, could push up the "pricing" of the ad, or at least show the potential.
You-tube like phenomenon with sales of potential advertising campaigns...would be fun :)
I`m not involved in the advertising industry as far as selling and bidding ads (such as for television), is this somewhat how the process works anyway? It would just be opened to the general public, and not just a few select larger advertising companies.
EDIT: just saw your update, still an intriguing idea. I always feel like I have some great ideas for products I love, would be interesting.
-You may indeed fail before you succeed, but don`t make it a habit.