I really really wish the flattr model would take off for stuff like this. Each and every site having a huge fundraiser once a year like this seems unsustainable.
My current startup work is aimed at avoiding that cost entirely.
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.