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I tried doing this with no luck....google wasn't showing any ads...so I wasn't sure if I was doing it wrong or if perhaps google couldn't determine the content of the page the adsense was being included on.
If no ads were showing, did you check to make sure the include had actually worked? In other words, did you view the source code of the page to make sure the adsense code was actually there?
If the adsense code is there, then it worked, if the adsense code isn't there, but the actual include statement is still there, it just means the server didn't parse the page (possibly trying to call an include from a static html page without telling the server to parse it?).