Just honest banner impressions at an affordable price. Ads are placed usually the day ordered. To Go, Inc. 250,000. These rates will be higher than General Rotation Banners, but they are more valuable to your company. This is good for sites that only want to get customers on their site now.
General rotation is still good, and be compared to a billboard on the highway.
The more traffic on the highway, the more the billboard is worth. Even if people can't show immediate response to the billboard, it still works. Just look how popular billboards are.