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They have 5 adsense blocks on their site, blended into the content. Good luck trying this as well if you are a "small" adsense customer!

when you have more than 5 million uniques, you qualify for Adsense Premium, at that point Google pretty much tailor fits the ads for your site

Thanks for the information!

Yeah, 'regular' adsense publishers have a limit of 3 blocks per page.