“Top iPhone apps make $400 to $5,000 per day” reads a headline over at Silicon Alley Insider. The right way to read the article, and any others citing a new report by iPhone ad server AdWhirl, is to scroll to the bottom. There, you’ll find the disclaimer that only free apps that crack Apple’s top 100 most popular list can make that kind of money. Everyone else? Long Tail.

AdWhirl’s more solid selling point is that the company claims 100 percent “fill rates.” That means whenever an iPhone user’s app requests an ad, a money-making ad is actually served. AdWhirl’s report says the average fill rate for iPhone ads is 60 percent.

How about it, app developers? Send us your own charts on fill rates, CPM and how much money you’re actually making.

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