Why don't you have a Auto Surf Function?
I don't know if you have ever actually tracked the number of visitors you get to your site that SIGN UP, but I have.
Even on a Manual surf site the percentage of signups per number of visitors is very low. The ONLY people that participate in a Auto Surf program are people that only want credits without any effort. They NEVER actually view your site.. They don't want to. Auto Surf programs are pretty much pointless.. Just a lot of people NOT looking at each other sites..