...if my max CPC for the ad group is 0,50, why the average for content target is 0,80? Is this a bug? Am I doing wrong anything?
Nope, no bug here. Robsp is on the right track with this post:
Well if you have higher max CPC's for some of your individual keywords than the average could be above the max cpc of the group I guess.
However this post is not quite correct:
It will use the max from the ad group. If you want this to be lower than for your keywords, set a low max for the group and then make individual higher bids for your individual keywords.
For Content ads, AdWords system considers all the keywords in a keyword list, but can charge the keywords with the higher CPC more frequently than your lower CPC terms- as these are the ones that'll make sure that your ad achieves the best possible ranking and appears on more content pages.
So when you have a default Max CPC of 50 cents for the Ad Group, but also have some keywords that have individual Max CPC of $1.00, it's possible to have a Content CPC of 80 cents - as your more 'competitive' keywords are being drawn upon more frequently than your lower CPC terms.
If you're not getting the ROI that you hope for on Content pages at the higher CPC, then maybe it'd be best to set the Max CPC for all keywords at the more 'comfortable' 50 cents.
Hope this helps to clarify what you're seeing.
Whew! This post got really long somehow. How does that happen?
P. S. On another subject from this same thread:
I a a bit concerned since after pressing the "send" button a blank page appeared with no "message sent" confirmation message
Very good point. I'll pass this feedback on.
AWA
But I guess this is a) already on the list and b) not going to happen as it will hurt the adsense program.
There should be a max CPC for content ads different from the one from the regular keywords simply because ROI is not the same (higher or lower but not the same).
Maybe Google wants to avoid the complications of having different rates for different types of ads. Fact is, there may be greater ROI differences between types of content ads (quality niche sites and DomainPark, for example) as there are between search and content as categories. So simply slicing the ad pie into two halves ("search" and "content") wouldn't really solve the problem of inconsistent ROI.
If they could be set separately, more people might opt-in to content. On relatively high dollar keywords we always opt out of content, but if it was possible to keep content bids somewhere between $.05 and $.25, they'd probably be used across the board.
Trouble is, where would those dirt-cheap ads run? Mostly in DomainPark, forums, and other venues that haven't any other way to generate income.
Most advertisers aren't looking for cheaper ads; they're looking for higher-quality traffic. The solution isn't to drive quality content publishers out of the AdSense network; it's to give advertisers greater control over where in that network their ads appear.