> A good food blogger focusing on the US/High GDP audience can get CPMs from $1-4
You're taking a risk here.
By mentioning this, a good fraction of the 300K Hacker News daily uniques will visit your site as I did, and some may be gourmands. Excellent uncluttered presentation and mouth-watering photography by the way.
On the other hand, you tipped off the largest gathering of highly motivated, entrepreneurial web developers to a business idea that no one expected to be so profitable.