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Apologies if this has already been discussed. I haven't been active at WebmasterWorld in months and I didn't see anything discussing this specifically after reading various threads while searching via Google (site:webmasterworld.com forum89 <search_phrase>).
I will stick with 1 ad per page, and I hope my visitors appreciate rich content and almost ad-free environment.
On the other hand, the author's comment
You might need to scroll right to see all of the ads.may well be "calling undue attention"....
Added: when I see something like that, I also wonder if the person who put the page together understands how to use AdSense. There are a lot of other distractions on the page, and I would think they'd get a very low CTR, possibly causing lowered EPC. Maybe the multi-block is an attempt to counteract that.
[edited by: hunderdown at 8:56 pm (utc) on June 1, 2005]