IAB banners have far better cpm for "placement ads". What do you do about that?

Standard IAB banners (Medium Rectangle, Skyscraper, Superbanner) do have a far better placement cpm than the other banners like the Large Rectangle. With the new ad marketplaces that bid within adsense their placement cpm can even increase.

There are advices that you should put the IAB banners where users would not click that often to get the "placement cpm" and put the big alternative Large Rectangle on the click intensive places.

What do you do about it?

I think the large rectangle blows every other unit away 2:1 or more, so if they are saying otherwise, i have no interest in any more of their thoughts

There are placements where no one clicks. These placements are best for ad formats that have high "no click cpm". Imagine the IAB banners cpm is 10 cent where the other banners only have 2 cent cpm. Putting two IAB banners on the footer brings you 20 cents cpm, and you can put one large rectangle in the "click area". That may be better than having two large rectangles on the footer that are not clicked and bring you 4 cents cpm total.

Most CPM networks have placement rules, ie above the fold, anyway.

I was adressing adsense internal cpm: Which adsense banners to put where to maximize your income.