Every time someone sees a banner ad on a site, we call that an exposure. Content providers typically charge around a penny per exposure. Click-throughs work differently. They only count if someone actually clicks on your banner. You will usually be charged ten cents per click through.
Registrations are the most expensive, but also the most valuable.
If someone clicks on your banner and actually buys something or signs up with you, content providers typically charge one to three dollars. Find out on Tuesday. Well, I think I've seen it all. A website dedicated to preschoolers. My site of the night, Enchanted Learning , offers your preschooler the same experience as Mom and Dad.