You have a friend who runs a popular Internet Café overseas (or locally). Your friend offers you a great deal on making your site (blog with AdSense on it) the default homepage of a select number of the PCs located in the Internet Café. You think, wow, what a great way to get more exposure to my blog and increase AdSense revenue. But then you think again.
That is the topic of a thread at WebmasterWorld named Internet Café. The members reply to the user's story with some very good and sound advice. Imagine Google seeing impressions each day from the same IP range, lots of impressions, lots of clicks - it should and probably will, raise a red flag. An other member tells his experience using WebmasterWorld.com while at an Internet Café.
This year, I was on vacation in Italy. When I visited webmasterworld.com from the internet cafe, I received an error message, that I have to log in, because of abuse from this IP address.
Forum discussion at WebmasterWorld.