I ran a $100 test yesterday to advertiser http://www.rustybrick.com/iphone/blackbook/ and within 30 minutes my $100 was gone. I received 26,815 impressions, with 200 clicks resulting in an average CTR of 0.75% with an average CPC of $0.50.

Today, I got my sales numbers for iPhone BlackBook and a total of 16 sales yesterday, which is not more than I normally get. 16 sales, where I earn 70 cents per item. That is $11.20 money earned, probably most of those were not from the ad, but even if they were, I lost $88.80.