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On the other hand, if you're selling scientific equipment, many people would expect you to do well from Google users.
I would assume that if they indeed clicked on the ad, they knew they would be sold something, regarless of what it was they were searching for.
I agree that the Google demographic is a bit more savvy, compared to AOL or MSN, and would buy more willing to buy tech goods, but that should not affect my query.
Time to test .... I fully expect a much higher conversion rate from clearly marked ads.