The Sponsorpool - An Alternative To Banner Ads?

Mr. Slippery asks: "A recent `Ask Slashdot' asked for thoughts about the Street Performer Protocol for funding creative work. I'd like to ask the Slashdot community for feedback on a different method, something I call the sponsorpool. (Mirrored here in case my DSL line gets Slashdotted.) It's a Web version of this: `Imagine that a street musician collects money in his hat. After every song, he reaches into the hat and pulls out a dollar bill (assume that all contributions are dollar bills). Contributors write messages on their dollar bills, and the musician reads out loud the message on the bill he selects. The more dollar bills - the more money - a contributor gives with their message, the more often their message will be selected and read to the audience.'" An interesting thought, but is this really all that different from banner ads? Would something like this work?