Prohibited Clicks and Impressions Any method that artificially generates clicks or impressions is strictly prohibited. These prohibited methods include but are not limited to: repeated manual clicks or impressions, incentives to click or to generate impressions, using robots, automated click and impression generating tools, third-party services that generate clicks or impressions such as paid-to-click, paid-to-surf, autosurf, and click-exchange programs, or any deceptive software.
It's all in there really... Ask yourself whether the scheme you are in really respects the above policy (it is not just fake clicks but fake impressions which are prohibited). If you are not 100% certain, either stop or ask Google.