From MIN Online.

When GQ magazine recently became the first major consumer title to put all of its content into an ABC-certified iPhone app no one knew quite what to expect. Condé Nast says today it is pleased that more than 18,000 copies have sold across the first two issues. Is that a good number? Who knows for sure? But Gartner says the app market is already showing hockey stick growth. 

If I were a GQ advertiser, I would say an additional 18k is a good number.