Interesting idea. The radiohead principle (as i'm sure it will now become known in some way) worked mainly because they were already losing 90% of their album sales to the record companies, so they still made just as much money (plus the release by XL on top) by doing it themselves. Whether this can work as a parallel to food i don't know. I doubt that people will end up paying more for the food than usual, at least not by much, and a lot more people will pay much less. Food is also generally more expensive than a cd, so i can imagine a lot of people rounding 2 courses to £10 when it maybe cost more like £20, just because theyve been given the option to do so. I think that people will be less inclined to be honest in pricing the meal. Personally, i think if i had the money to spend then i would pay what i thought i was worth, but i can see this idea being exploited by people who can't afford to pay those amounts.