I don't think it would be worth the effort to try monetizing. These things are a dime a dozen and they get blacklisted quickly. They can also be expensive to

I don't think it would be worth the effort to try monetizing. These things are a dime a dozen and they get blacklisted quickly. They can also be expensive to run because of the bandwidth usage. Also, some hosting providers don't allow proxies. My biggest problem with them is that I wouldn't want my server IP address showing up as accessing pedo sites or other types of illegal sites because of the users. Even worse is that some proxy server software caches sites by default (and can even get spidered.) Good luck, but I think your efforts would best be spent elsewhere.