Surely most of you like proxy sites to surf the web because allow you to bypass proxy restrictions at your school or work. But what about others visiting your site through a proxy site ? Probably you don't like too much because most of them remove your ads and insert their own ads, usually with non-friendly ads (pop-unders, in-vue, interstitial, adult ads, audio ads...). That sites are getting YOUR content and inserting THEIR ads, so they are wasting your site bandwith and you don't get any money .