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However, I was musing about where the line is drawn between "encouragement" and "clarification". For example, you cannot draw attention to the ads. But, what about on your "disabled" version of your site? Adding a sign simply saying "Ad" would certainly help users with bad eyesight, etc.
On the other hand, I rather that they did click on the ads, rather than stayed on my site, heartless b*****d that I am! :)