Each time you show an Exchange banner you earn a credit that buys you one free exposure on the Exchange. Each time someone clicks on an Exchange banner on your site, you will earn an additional credit. You want lots of visitors to see your site. You can use your banner to advertise your site on other sites that are similar to yours. This targeting is going to get your banner noticed by other sci-fi and fantasy fans.
Most banner exchanges have almost no targeting.
Your banner could show up on any kind of unrelated site and be ignored. You can also use our Exchange to track your web site stats while promoting your site at the same time. Our service is completely free. We simply want to help sci-fi and fantasy fans find your sites. Many other exchanges mix promotional ads in with the member banners in an attempt to make money.