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I don't think you'd have to worry about clicking, unless Google decides to go with some sort of compensation later on for visitors who click on related searches.
What's sick is that I don't even feel comfortable clicking on related searches out of fear they'll send the dreaded fraudulent clicks letter.
Yes, you should feel fear and extreme discomfort. AdSense banners are holy and the God (i.e. Google) wants you to be afraid, because in this way you will not make some stupid things like doubting in God's judgements ("nobody is without a sin, nobody is without fraudulant clicks - each and every of us will get fraudulant clicks e-mail sooner or later, but only selected will not be dumped")
So keep your hands off AdSense banners, man. If you treasure your life or God will punish you. I wish it could be a joke. It isn't.