The traffic you can get from banners is actually some of the most targeted, interested traffic you can possibly get. You see, by advertising on sites that are relelevant to whatever you're promoting, you're already narrowing down the market to those that may buy... and when those people click, they're narrowing it even more!

It's estimated that 95% of all paid web traffic comes from actual sites, not search engines, PPC, or anything else. That means people clicking links from one site to another... as in advertising. Think about that - if you've been working with SEO or PPC, you've been leaving 95% of the money on the table without even realising.