I was reluctant to read their FAQs before. But now I browsed to that page and this is what I found:

Q: Where do my ads appear?
A: Enhance Interactive works with more than 50 partner networks to deliver billions of searches a month to our advertisers. While providing a full list is not possible due to the competitive environment and the dynamic nature of these networks, the majority of our distribution is generated through the following channels: search applications, direct navigation properties, and vertically focused Web sites.
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I feel really stupid as I paid them $150 / day for clicks during a few months