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In the five past years AS has been great to me. Now my cpc’s and eCPM’s are very low.
So, I have a public proposal to Adsense.
A threshold in each channel (or in each ad unit). “Please do not show Adsense ads in this channel unless it pays more than…”
You may specify min cpc, or min eCPM.
If there are not advertisers for that price, then place my default html.
It’s very simple. Hope this may help.
Since there are alternatives to Adsense -- especially at low CPC's -- this would have the effect of reducing Adsense ad slot inventory by some unknown amount.
As for advertisers, it would surely reduce the inventory at the lower end of the CPC scale. Partly by that effect and partly by the increased competition to display an ad, it would raise the average bid. That, of course, would reduce the number of ads bought.
However, allowing such thresholds would enable sites that currently can make more money with other ads than with Adsense ads to profitably display _some_ Adsense ads, increasing the ad slot inventory.
Depending on which of these effects dominates, it is possible that Google would actually make more money.
Anyway, it would be an interesting experiment, but I'm not holding my breath.