I’m focusing on advertising with large banners, especially skyscrapers. They let me show off my art which is a big seller since it’s a story based comic. My guess is size is less important if you have a good hook. Now there are exceptions to the rule, there’s one site I advertise on with the size above a button and I get good returns, but generally those ads are easy to ignore for size alone.

As for expensive high volume sites versus the others – I’ve found the volume of the traffic from the site you advertise on is less important compared to the type of place you advertise. I’m hitting big with superhero and zombie sites as well as some dark humor. I tried basing it on volume alone and while I got some decent hits, there’s one site that I’m barley paying anything for and getting a lot of clicks. In the end, spread your ads out there and see what common denominator the sites have, then use that to narrow your advertising focus. Set a click through goal as well. Mine is $.05 or less. If I’m paying $20 a day that’s fine if my click through rate is still $.05 per click. This goal is important to keep your cost down and maintain a value.