Site promotion through ASD?

I have been promoting my Christian books and publishing services through Ad Surf Daily as an marketing experiment for about a month now. It is an ad surfing co-op enterprise. I have generated 1200 visits to my sites and obtained one solid prospect contact (for publishing services). I started with a free membership which allows you to promote one web site for 10 days. I then bought $50 in ad packages, which qualifies you to promote 3 web sites (or one site three times as much). In one month's time I have received $15.61 cash back in rebates on that $50 ad purchase and will continue to receive rebates until I get 125% of my purchase price back (looks like that will take 3-4 months). By that time I will have generated 4-5 thousand hits to my sites and have my ad money back (plus 25%). I would be interested to know if anyone else is promoting books or publishing through ASD or any other such system. If you want to experiment with it, you can go to http://72.32.185.200:8080/?ref=17573.