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JS_Harris - 3:08 am on Jan 4, 2008 (gmt 0)
What that means is that if a site fails because of visitor revolt (an extremely rare occurence) the advertising dollars end up on other sites... which creates more opportunities to fill the void. As long as there are advertising dollars to spend, I don't see this as being a real issue.
I think that the report gives only an extremely narrow view overall and may apply only to a small number of sites in general. I know for a fact that on some sites the advertisers are itching to grab some of the very limited placements available.