One advertiser?

Why just one advertiser in my adsense ads?

[Ducain3]

I check my site today, and notice that ALL the Adsense ads are from the same company.

Forgive me for not keeping up, but what exactly does this mean. I didn't think this was possible. The ads are incredibly ugly text ads, and so I don't think this is the CPM system kicking in.

Any thoughts?

[tke71709]

Not sure why you don't think this is a CPM advertiser, everything you have written points to it being a CPM advertiser.

CPM ads can be text ads, not just image ads.

If you have ad formats that normally hold several ads (skys for example) and you only have one advertiser displaying there then you are looking at CPM.

Check your channel for revenue with no clicks.

[Alternative Future]

It might have something to do with this thread [webmasterworld.com]

-George

[Ducain3]

Hm...

I just read this (from Adsense control panel), and wonder if this is what's going on?

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To increase monetization on your site and improve the relevance of ads, AdSense now varies the number of text ads that appear in a given ad unit. In cases where we determine that increasing the size of the most relevant ads will improve performance, we'll drop the lowest-performing ad or ads and expand the remaining ones to fill the entire unit. Showing fewer ads works to your advantage, allowing the better-performing ads to draw more user attention and click-throughs. Google AdSense technology will automatically determine the optimal number of ads to display on any page and will only show fewer ads when doing so will make you more money!

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George: Thanks, I should have read that already. I've been kinda out of it for a couple of weeks. :(

[Rodney]

Showing only one text ad across an ad unit is also a sign of a CPM ad.

[berto]

All of this variability makes channel testing kind of tough, doesn't it?

So, suppose hypothetically that

--on page A you are testing (and tracking with channels) a leaderboard above your page title

versus

--on page B you are testing a leaderboard below the page title

Now, also suppose that, due to the specifics of page content,

--page A always induces 4-ad displays

while

--page B sometimes induces 4-ad displays, sometimes 3-ad, or 2, or 1, or sometimes single-ad CPM displays.

Under these circumstances, without being able to enforce "everything else being equal," how is one supposed to effectively test whether position A (above the page title) versus position B (below the page title) is better?