I think the obvious reason is marketshare. Most websites were running Google AdSense, so AdBrite didn't have as large a catalog of websites to advertise on. I remember browsing the websites on there in my niche, and the majority of AdBrite publishers I saw were splogs with scraped content.
Sometimes AdBrite wasn't serving ideal ads to publishers. I remember one site that had acai berry & weight loss ads, on a page specifically about not letting mass media dictate your self-esteem about your appearance. I guess AdBrite didn't have the critical mass of advertisers for better ad selection/targeting.
On the other hand, as an advertiser I liked how AdBrite was setup. I could target a specific website & specify exactly where on the page of that site I wanted my ads to appear. My most successful display ad campaign was on AdBrite (though I'm something of an advertising newbie). For that reason I'll be sad to see AdBrite go.
Sometimes AdBrite wasn't serving ideal ads to publishers. I remember one site that had acai berry & weight loss ads, on a page specifically about not letting mass media dictate your self-esteem about your appearance. I guess AdBrite didn't have the critical mass of advertisers for better ad selection/targeting.
On the other hand, as an advertiser I liked how AdBrite was setup. I could target a specific website & specify exactly where on the page of that site I wanted my ads to appear. My most successful display ad campaign was on AdBrite (though I'm something of an advertising newbie). For that reason I'll be sad to see AdBrite go.