QUOTE(Gogole AdSense)
Web pages may not include incentives of any kind for users to click on ads. This includes encouraging users to click on the ads or to visit the advertisers' sites as well as drawing any undue attention to the ads. For example, your site cannot contain phrases such as "click here," "support us," "visit these links," or other similar language that could apply to any ad, regardless of content. These activities are strictly prohibited in order to avoid potential inflation of advertiser costs. In addition, publishers may not bring unnatural attention to sites displaying ads or referral buttons through unsolicited mass emails or unwanted advertisements on third-party websites. Publishers are also not permitted to use deceptive or unnatural means to draw attention to or incite clicks on referral buttons.
Nope, we can't say a bunch of the stuff we've said in this thread.
Basically, the users have to click the ads themselves without any obligations, favors or payment. Meaning that they have to be ligitimate clicks.