True, of course, but I'm going to bet that the number of users who figure that out will be too small to have any type of impact on ad impressions. Also, I'm still using vB's template conditionals in the forums, so the technique won't work there (of course, won't visiting vB pages also reset the cookie?). This is primarily designed to hide ads on my WordPress installation, which contains pages and posts that can get hit hard with traffic. If I can save a trip to my vB DB on all those page loads (most of which will come from unregistered, new visitors), it has to be a good thing.
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