I won't call it a success story, but it adds a few dollars to my income every month... I use it only for sites where Adsense can't be used.
Hi ... used AdBrite, off and on, for more than a year; almost two, I think. What revenue I earn, I spend as an advertiser. I can get 2000 tgo 5000 visitors, most days. Not a success story, but my story. Hope this helps. Good luck.