Flattr won't work for the same reason as every other tipjar system has failed. It imposes a transaction cost on the tipper -- "is this work the click?" -- that users simply don't like.
My current startup work is aimed at avoiding that cost entirely.
> It imposes a transaction cost on the tipper -- "is this work the click?"
Since you have a set monthly amount that's just split up among your clicks, I don't see how that's true. You can click on every single site you browse to and it'll just split up your $15/mo "web budget" thinner and thinner among the sites.
My current startup work is aimed at avoiding that cost entirely.