I often, like to switch between adsense and valueclickmedia on my site. But I think recently VCM has changed where I think they sell publishers inventory in advance? Not sure....
Like for example, yesterday I wanted to do a full vcm blast for the 300x250 ad unit on my site and give it 100% impressions, which is like 90k-100k pageviews.
I look at my VCM ucp and my earnings are exactly the same as they were on any other day. I haven't served the 300x250 unit for a few months now, except as defaults. Which equates to around 9k impressions to them tier down from adsense.
So my question is...has anyone noticed the same thing? I don't remember it being this way with VCM. I had them for a few years now.
Maybe you have to sell, your inventory in advance now?