If you don't mind me asking, what CPM do you get from the ads? Which are the ones that work the most, the horizontal visual banner on top, the textual ones in the right, or the squared image in the bottom?
I'm quite surprised that you managed to have such high number for such a small niche. That's great!
I'm the first surprised here! As I said in the blog posts, RPMs are way higher since I started tweaking the ads.
RPMs were 9.75EUR last month ($13).
The best performing ads are the one in the template gallery (horizontal banner) at http://www.giftcertificatefactory.com/templates/personal/
People on french forums didn't actually trust me when I gave them the numbers ;-)