Proxies are very cheap for low quality traffic. The proxy servers also have an option of changing your ip address so you can hide from the prying eyes of your bosses, parents or colleagues. Sometimes it is difficult to find free proxies that don't have ads at the top. Sometimes it's hard to make sense of how to use the system. It would be nice if there was more info provided about what each button does. Also I think some of the proxy servers are slow compared to others. I am using this service for my website to help with SEO and getting more visitors.