Really! Right now there are three open slots and all are cheap
Top spot is reserved for the Obama ad as long as it is renewed, but other ads will be rotated daily to keep them fresh.
Click throughs to loads is about 1/100. That is pretty decent. I don’t have data on contributions. Site traffic on weekdays is average 300+ and does better when I’m more regular–allergies interfere from time to time. And much of that traffic is narrowly targeted to political junkies.