The reason why I ask is because I'm using OIOPublisher on my website to manage banner ads and there is only a spot for one URL and one image. I use the link to the campaign and follow it with the banner image. Will this be enough to ensure it keeps track of my sales? Is the 1 x 1 pixel image even necessary? Thanks in advance
It is probably to counter cookie stuffing. They would verify that the clicks is not over a certain ratio of the image impressions. Just a guess though.