you have a typo in url . Theres no site for startsusingproxy but there is a proxy site for startusingproxy btw did you faced any probs with .info when going for LEs .
How much you make depends on your traffic and the relevancy of the ads. I would suggest typing a few paragraphs containing site-related keywords in your footer, so that the ads are targeted a little better (this doesn't hurt your SEO efforts, either!).
Adsense cannot be put on the proxified pages but its totally fine if you put it on the homepage of the proxy.