There are several major dating sites that have been spending close to $100k/month on the site and with the recent change in adsense, adsense was basically converted to a Banner ad network.
The CTR on text ads declined about 60% in the last 2 months with googles changes, Image ads on the other hand stayed the same. If you take a screen shot of a text ad and then run it as an image ad it will get 2 times the click thru rate.
If you want an ad that will get a lot of traffic create something like this.
If you want even more traffic, Create 5 different ads or variations on these ads. Then set the campaign to display them all equally. This way 1 person isn’t going to see the same ad 20 times. If you are a company like american singles you could create a campaign with 6 banner ads for 6 different sites. This will create a sort of artificial Frequency capping ability, something that google REALLY lacks.
I also suggest making use of the 37 channels set up on Plentyoffish, many of them are women only, men only, grouped by age etc. But most importantly if you are using CPM based text ads on the site they are going to do very poorly because of the dramatically reduced click thru rate.